Storm asymmetrical bowling ball layouts

This is my personal cheat sheet to bowling ball specifications.

Every ball made these days is pretty complicated so understanding these specs (even at a very basic level) will go a long way to improving your understanding of ball motion and the potential a ball has to improve your arsenal.

For starters their are two different types of balls: symmetric and asymmetric.

Symmetric vs Asymmetric Bowling Balls

Symmetric balls tend to have low differential whereas asymmetric balls tend to have high differential – the difference between the maximum RG and minimum RG of a bowling ball.

When a bowling ball’s differential is higher the ball has the potential for more flare.

Although any ball with a high differential has the potential for maximum flare on a bowling lane any random asymmetrical ball in your bag will usually flare more than the random symmetrical ball because they naturally have higher differential values as a rule of thumb.

Simply put – Asymmetric bowling balls will flare more resulting in a stronger skid/flip ball reaction – frequently this means a stronger back-end with a comparatively weaker mid-lane read.

Read more technical info here:

What the Heck is RG and Why Should I Care?

Every bowling ball has at least two axes.
The “X-axis” is commonly known as the the low RG axis of a bowling ball. This axis travels through the core from the top of to the bottom with the pin being the top of the ball.

The “Y-axis” on the other hand is commonly known as the high RG axis of a bowling ball which is exactly 90-degrees offset the X-axis.

In a symmetrical ball the y-axis is exactly the same all the way around the ball just as the equator of earth is the same all the way around the planet.

In an asymmetrical ball there is actually a single point on this equator line that is called the preferred spin access (PSA) and is marked as a specific point 90-degrees off the pin (or top of the ball).

This PSA access is sometimes referred to as the z-axis because it’s the only access point that is offset the x-axis that remains the same on both sides.

The X-axis follows the most stable and preferred rolling axis of the ball. It travels through the pin to the opposite side of the ball.

The Y-axis would be perpendicular to the X-axis and although it would be relatively stable it wouldn’t be the preferred spinning axis of the ball. With friction the ball would want to migrate to a more stable rolling axis, ultimately the X-axis which rolls perfectly around the pin.

In an asymmetrical ball the main pin is also paired with a second marking min called either the PSA Indicator Pin or the Mass Bias (both names are interchangeable and mean the same thing).

In an asymmetrical ball this is the Preferred Spin axis (not the X-axis as it is in symmetrical balls).

Asymmetrical balls will migrate or flare towards the PSA axis as it is preferred.


In a symmetrical ball the thumb hole will be the preferred spin axis (PSA) although it will be a weak PSA compared to the PSAs in asymmetrical balls.

In symmetrical balls the Pin-to-PAP distance is the largest determinate for ball reaction aside from coverstock.

A 3.375″ Pin-to-PAP distance will yield the strongest ball reaction because this will force the ball off the hand into the most unstable ball roll possible for the symmetric core. This high level of instability results in maximum track flare which is why the ball will have the strongest reaction (change of direction).

Pin-to-PAP distances that are greater than this will read the lane progressively later (and less aggressively) as you approach the maximum 6.75″ distance.

Distances that are shorter than 3.375″ will read the lane earlier but to a lesser degree as the distance gets closer to zero.

No matter whether you go high or low with your Pin/PAP distance your ball reaction will be muted because track flare will be lower on both sides of the scale.

Pin/PAP distances that are on the high side will operate in conjunction with the ball’s larger radius of gyration (RG) measurement while distances on the lower side of the scale will operate in conjunction with the ball’s lower RG measurement.

In general high RG balls read the lane late and low RG balls read the lane early.

Each ball has an RG spread which compares the lowest possible radius of gyration (or spin) to it’s highest possible radius. The difference is neatly called the differential and the bigger the differential the more potential the ball has for track flare.

If the Pin-to-PAP distance is exactly at 3.375″ then you can take advantage of the maximum track flare possible on a bowling ball.

If you want the ball to err on the side of reading late then the Pin/PAP distance should be just over 3.75 inches and it should be just under if you want your ball to err on the side of a early read.

If you want a ball to read late but strong then you should choose a ball with a high maximum RG and a wide differential and set your Pin-to-PAP distance to 3.375″.

If you want this same ball to read late but weaker then the 3.375 inch distance should be expanded in the direction of 6.75″.

Conversely a ball the reads early and strong should have a low minimum RG with a large differential and set your Pin-to-PAP distance to 3.375″.

If you want this same ball to read early but weak then the 3.375 inch distance should be shortened in the direction of zero inches.

Usage notes:

In general a longer Pin/PAP distance will conserve energy through the heads and mid-lane reserving it for the back end.

This can be helpful for situations where there is burn in the heads or mid-lane. The longer Pin/PAP distance will help the ball skid over the burn area reserving as much energy as possible for the backends.

On the flip side shorter Pin/PAP distances will read earlier leaving less energy available for the backends.

On fresh patterns, heavy oil, long conditions, or even super short patterns a shorter Pin/PAP distance can be a great tool for controllable and predictable movement that flattens out a lot on the backend of the lane.

In the middle of the spectrum the strongest layout distance of 3.375 inches is usually conducive to transition games, heavy oil conditions, and generally longer patterns.

How About The Shape of the Curve?

Beyond the RG being small or large, the differential being big or small, and the Pin-to-PAP distance being short or long the shape of the ball’s change in motion can be altered a bit by altering the VAL intersection with the Pin-to-PAP plane.

If the angle that the planes intersects is around 25 degrees then the the direction change of the ball at the break-point will be more abrupt.

If that angle is 35-40 degrees then the direction change of the ball will be smoother and more continuous (less abrupt or angular).

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Customer Reviews | 107 Customer Questions

By Spartanfanatic from IL

5/5 Stars

Bottom Line:

Yes, I would recommend this to a friend

Love it

Had this bowl drilled 1.5 inch pin-pap and love how consistent and smoothly it rolls. When I just can't figure out the shot this is my go to ball.

By Spartanfanatic from IL

5/5 Stars

Bottom Line:

Yes, I would recommend this to a friend

Love it

Had this bowl drilled 1.5 inch pin-pap and love how consistent and smoothly it rolls. When I just can't figure out the shot this is my go to ball.

By Dave from Babylon ,NY.

5/5 Stars

Bottom Line:

Yes, I would recommend this to a friend

This ball is a really good ball

Very good hooking ball . It has the driving power . I give this a 5 star rating.

By Cody j from Paducah Kentucky

5/5 Stars

Bottom Line:

Yes, I would recommend this to a friend

The best ball ever my average increased with this ball

I would definitely recommend this ball!!! It hits the pocket every time, very accurate ball, and is absolutely amazing!!! Get this ball if you are looking for a ball to increase your average

By Dylan from Denver, PA

5/5 Stars

Bottom Line:

Yes, I would recommend this to a friend

I'm buying another one before it gets discontinued.

This ball has delivered games of 290, 299, and 300 in the short time I owned it. Not only that but several very high 700 series. This ball is so consistent, all I have to do is be consistent with my release and the ball will do the rest. I have severe arthritis in both knees so my approach is somewhat compromised but this ball really holds the line and doesn't overreact in the backend. Just pocket hit after pocket incredible and one of the best balls storm has ever produced.

By Tony from Chicago

5/5 Stars

Bottom Line:

Yes, I would recommend this to a friend


This Ball is a Must Have highly recommend it!

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Customer Questions & Answers | Reviews

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How would phase 3 compare to motiv forge fire

10/28/2019 - By Hamster

Have an answer to this question?


The Motiv Forge Fire is listed as a high performance ball while the Phaze III is an upper mid performance so the Forge Fire will be stronger. Also the Phaze III is polished to go longer on the lanes than the Forge Fire. Lastly the Phaze III is rated for more medium oil conditions while the Forge Fire is for medium to heavier oil.

10/30/2019 - By Bowling.Com Staff
0 of 0 customers found this answer helpful. Did you? Yes | NoDid you find this answer helpful? Yes | NoThanks for your feedback!


How can the Storm Phaze 3 compare with the Storm Super Son!Q

11/3/2019 - By BC

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The Phaze III is designed for more length and a strong backend. Because the Phaze III goes so much longer on the lanes it is ideal for medium oil conditions. The Super Son!Q is duller and this helps it to read earlier on the lanes and also can handle medium to heavier oil because of this.

11/4/2019 - By Bowling.Com Staff
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How would this ball compare to a Marvel Pearl

11/4/2019 - By Matt

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The Marvel Pearl was going to go just slightly longer on the lanes than the Phaze III. The hybrid cover on the Phaze III helps smooth the reaction on the backend some so the Phaze III still goes long on the lanes before hooking but it is smoother on the backend while the Marvel Pearl is more angular.

11/5/2019 - By Bowling.Com Staff
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What is difference be the phaze 3 and the iq emerald

11/5/2019 - By BC

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The Phaze III is going to have a stronger hook potential than the IQ Tour Emerald. The Phaze III has the R3S Hybrid cover which helps the ball read a little earlier and smoother than the R2S Pearl cover on the IQ Tour Emerald.

11/6/2019 - By Bowling.Com Staff
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That one bowling ball I really want 16 pounder

11/10/2019 - By Johnny o

Have an answer to this question?


We have this coming in stock on December 13th and we will have 16lbs available.

11/13/2019 - By Bowling.Com Staff
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Does the 12 lb. ball have the same core as the heavier balls

11/12/2019 - By Jan

Have an answer to this question?" />


Unfortunately the 12lb does not have the same weight block as the 14-16lb weights. To see more details on the weight block you may visit Storms website here:

11/12/2019 - By Bowling.Com Staff
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How does the phase 3 compare to the phase 2?

11/21/2019 - By n

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The Phaze 3 will have a polished finish which makes it go further down the lane and have a sharper backend hook while the Phaze 2 is designed to read the lanes earlier to have a smoother arcing hook.

11/22/2019 - By Bowling.Com Staff
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How does this compare to a dv8 turmoil?

11/22/2019 - By AL

Have an answer to this question?


There are a few different Turmoil balls and they are all listed as mid performance while the Phaze III is an upper mid performance ball. So this should be a little stronger hook potential than the Turmoil series.

11/27/2019 - By Bowling.Com Staff
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How does the Phaze III compare to the ProMotion

11/24/2019 - By dee

Have an answer to this question?


There are a lot of differences between this and the ProMotion. This ball is designed for medium oil and the ProMotion is for heavy oil. This ball is designed to go longer on the lanes for a sharper backend hook and the ProMotion is designed for an earlier smoother arc hook.

11/26/2019 - By Bowling.Com Staff
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How does this ball compare to the astrophysix

11/26/2019 - By Tony

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The AstroPhysiX would be more aggressive and react later than the Storm Phaze III.

12/11/2019 - By Bowling.Com Staff
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Phaze 3 vs Astro Physix. whats the difference in reaction. Thanks

12/2/2019 - By Israel

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The AstroPhysiX would be more aggressive and react later than the Storm Phaze III.

12/10/2019 - By Bowling.Com Staff
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The AstroPhysiX would be more aggressive and react later than the Storm Phaze III.

12/10/2019 - By Bowling.Com Staff
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Will the Storm phaze 3 match up well with the Storm Astrophysix

12/3/2019 - By BC

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The AstroPhysiX would be more aggressive and react later than the Storm Phaze III.

12/11/2019 - By Bowling.Com Staff
0 of 0 customers found this answer helpful. Did you? Yes | NoDid you find this answer helpful? Yes | NoThanks for your feedback!


The AstroPhysiX would be more aggressive and react later than the Storm Phaze III.

12/11/2019 - By Bowling.Com Staff
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How does the phase 3 compare to the brunswick prism hybrid??

12/3/2019 - By 21

Have an answer to this question?


They would be a very close comparison actually. They are both hybrid coverstocks with a polished finish to give them great length. They are both rated for medium oil but the Prism Hybrid is in Brunswicks high performance line while the Phaze III is in Storms Upper Mid performance line so the Prism Hybrid may be just slightly stronger.

12/5/2019 - By Bowling.Com Staff
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How does the phaze 3 compare to the hy-road nano?

12/6/2019 - By Egg

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Best symmetrical and asymmetrical bowling ballThe selection of the right bowling ball takes time. So, if you are a beginner and have the wrong ball, it can make a serious blunder. You may not have the right scores, but the possibilities of mistake decrease with the right bowling ball. At the same time, the proper bowling ball can increase the chances of hook.

However, you need to know about the types of bowling balls and which one is the best one for you. Generally, there are two types of bowling balls available – asymmetrical and symmetrical. You need support from an asymmetrical bowling ball when you are bowling on a heavy oil condition with an aggressive mood. But if you need consistent performance and a relatively slower motion, the symmetrical bowling balls will help you in medium to dry conditions.

Let’s begin the journey to discover the weapons of your bowling arsenal, and have the best symmetrical and asymmetrical bowling ball that suits you more.

Let’s begin the journey to discover the weapons of your bowling arsenal.

Symmetrical Bowling Ball: Top 3 Picks

Asymmetrical Bowling Ball: Top 3 Picks

Best Asymmetrical Bowling Ball: Top 5 Reviews

1. Roto Grip Halo Bowling Ball

Roto Grip Halo Pearl 15lb
Roto Grip Halo Pearl 15lb
  • This Bowling Ball Ships Undrilled With No Holes Unless You Add Drilling Services. This Ball Was Designed To Be The...
  • However, The Big Difference Is The Cover Stocks. Wrapping This Core With The Etrax Pearl Cover Creates Motion In A...
  • If You Were To Drill A Halo Pearl And A Halo The Exact Same, You Would See Approximately 6-8 Feet More Skid, Which...
  • The Now Famous Centrum Core Has Quickly Become A Fan Favorite Due To The Radial Disc Which Helps Increase...

Do you love to add some tactical advantage in the bowling alley?

Who doesn’t love it! I think Roto Grip Halo Bowling Ball is the perfect companion.  The center of the ball is the outcome of exceptional engineering. Therefore, the ball has extraordinary rotation and continuation. Interestingly, you can roll down the ball in any condition.

You will be surprised at the overall steady motion of this bowling ball even in heavy oil conditions. It destroys the pins for its asymmetrical core. Also, it has the latest traction coverstock.

So, do you want to rule over the bowling alley?  In that case, you should accept these bowling balls as your ruling partner. It is covered with the MicroTrax-S18 coverstock. The finish is at 2000 grit matte.

Or, if you want instant recovery of your misses at the bowling alley, this ball can do that since it runs on various surfaces, no worries, even if you are a beginner. Play straighter and check the result. It’s highly reactive.

This ball hooks! Honestly, Halo Pearl is different than other asymmetrical balls. It starts creating motion from the mid lane of the alley. So, if you are confused, wait, and observe the action. Undoubtedly, the ball will hit the spot. For the exceptional pairing of the most energetic core and coverstock, it’s selected as the best asymmetrical bowling ball


  • Strong coverstock
  • Motion begins from mid lane
  • Smooth transition
  • Versatile application


  • Suits left-handed people most
  • No other cons available

2. MICHELIN Storm Omega Crux

I know that most of the bowling ball reviews recommend asymmetric core. Any idea why they recommend so?

Well, such a core can perform to the fullest. The motion is healthy, goes following a curve shape, and hits the pins like a truck. This MICHELIN Storm Omega Crux has all the potentials. It has a pearl reactive coverstock for improved performance. You will be happy for its 3000-Grit Abralon finish that shines through the bowling alley.

Surprisingly, you can see the performance of the latest technology. The bowling ball can recover even if you make mistakes in rolling it down. Consistency is another plus with the ball, and it has a very sharp hook. Predicting continuous motion is not always possible, but it hits the targets like a storm.

The omega acts like a hybrid and tends to start later than a solid ball but still gives you a more predictable continuous motion. Because of the GI-20 cover, the ball can dig into a speedy manner and hits the pins like a cannon shell.

Versatility is another feature of this ball. Drilling through the ball is an effortless task. In line with friction, it can stay in the center of the alley. No matter if the alley is dry or wet, you can have as many shots as you need. And smoothly. Also, if you have low rev, this is a great one for your practice or leagues. The ball will continue through the pin while some other bowling balls even can’t hit rightly.


  • Suitable for high and low rev players
  • Stronger construction
  • GI-20 Pearl coverstock with Asymmetric Catalyst core
  • Speedy performance


  • Speedy reaction
  • No other disadvantages found

3. Brunswick Kingpin Rule Bowling Ball

Brunswick Kingpin Rule 14lbs
Brunswick Kingpin Rule 14lbs
  • Color Maroon/Orange/White
  • Core Kingpin Ultra Low RG
  • Cover stock ECA-XR
  • Cover Type Solid
  • Finish 500 and 2, 000 Stair Micro Pad

The Brunswick Kingpin Rule works like a king. Want to know why?

Many of the bowling experts prefer this ball. Because it is the best upper mid-performance bowling ball, also, it is more durable and efficient. It has a very solid coverstock with 500/2000 Siaair Micro Pad finish. So, it can roll down in various alley conditions, including dry and wet. But experts recommend using the ball in heavy oil conditions for better performance.

The addition of Ultra-Low RG makes it a must for your arsenal. With the and the DynamiCore, the ball hooks more than usual. So, you can be the ruler in the alley.  Interestingly, the coverstock is ECA-XR and solid. You may wonder about its pin-hitting performance. This is a game-changer.

It is also the perfect bowling ball when you are dealing in a more robust pattern. No worries if the design is more extended as well. When you prefer a lower rev, try this ball. It retains energy and starts delivering power from the mid lane. It will carry the corners pins too, not to panic.

Do you know that the pro-traction rating of this ball is over 80?

It happens for the robust and reactive outer shell. However, experts also recommend having a weaker drill in this ball to get the best out of it. Color combination is another aspect that you will admire. It looks cool when you roll down the ball to the bowling lane.


  • Incredible continuation
  • Easy rev up
  • Fits versatile surfaces
  • Stronger construction


  • Not suitable for all level players
  • No other cons available

4.  Track Precision Bowling Ball

Track Precision Solid 15lbs
Track Precision Solid 15lbs
  • Color: Blue/Yellow/Black
  • Lane Condition: Heavy Oil
  • Overstock: Prime Sold
  • Finish: 500/2000 Abalone
  • Core: Asymmetrical

Do you know the rule of success in bowling?

Delivery of the ball on-point will take you to your goal. If there is a consistent grip like Track Precision Bowling Ball, your success is a matter of a few seconds. With the Prime Pearl coverstock, this bowling ball is paired with a 500/ 1000 Abralon. It also has a factory finish that makes it look amazing. Down the lane, this ball has an angular reaction. So, all your pins will be ditched instantly.

Do you need energy in your bowling ball? Energy retention is another feature of this bowling ball. It has a high differential reaction. You will also have a high RG. Thereby, energy retention is smooth, and it explodes in the end.

Precision is the key aspect that helps to get the specific motion for the bowling ball. These balls roll down the alley and start turning stronger from the mid lane. Therefore, when it reaches the end line, it explodes. Consequently, the pins cannot stand against the ball.

You can set your angel while rolling down the ball. It happens for the smooth transition of the ball. So, you should not miss the chance to test it, should you?

At the same time, this ball has a steady back-end motion. So, it can move inside the lane. Hence, if some corner pins are remaining, you can quickly recover those.


  • Plenty of hooks
  • Effortless control
  • No, overreact
  • Predictable transition
  • Strong construction


5. DV8 Night Prowler

Do you love to puzzle your pins down the bowling alley? You need a speedy bowling ball like DV8 Night Prowler. If you are a pro, you cannot but love this bowling weapon.

Like the other storm bowling balls, it can devastate the pins, and they won’t see it coming towards them. Also, you have several drilling options. So, managing the bowling ball when you roll it down. Rolling down on several surfaces is a unique feature here. You can use the bowling ball for wood lanes or oily lanes.

Are you still confused?

Check the back end motion of this ball. The specialty of this DV8 bowling ball is that it hits the pins hard on the deck. It changes the direction instantly and efficiently.

Also, this ball comes with an exceptional warranty period (4-year limited warranty). Paired with Dynamicore technology, it owns much more hook potentials than other similar products. It flies during the roll and suitable for medium patterns.

The bowling ball has a 500 Siaair. The crown factory compound finish is another plus in line with the DOT technology. So, drilling is not a big deal here. You can have your drill at any part you want.

On the other part, it has a natural reaction, which ensures a big back end. Don’t get surprised. The bowling balls are also suitable for medium oil condition rolls. If you love speed and a quick reaction, try the ball at least once. And there would be a surface scratch.


  • Clean through the head
  • Smooth continuation
  • Greater speed
  • Four-year warranty


  • The angle is too sharper
  • No other cons found

Let’s take a break.

What is your favorite bowling alley? You can write the name in the comment box below.

Well, we have reviewed the Best Asymmetrical Bowling Balls so far. Do you mind checking some of the Best Symmetrical Bowling Balls?

Here you go!!

Best Symmetrical Bowling Ball: Top 5 Reviews

1. Pyramid Pathogen X Bowling Ball

Which is your preferable lane?

If medium lanes are your choice, Pyramid Pathogen X Bowling Ball is a must for your arsenal.

This bowling ball comes with a New Era 139 Symmetric Core. It also has a 2.54 RG paired with 0.032 Differential. The GPS Navigational Pearl Coverstock is another plus with the bowling ball. You also will enjoy the benefits of 2000-Grit Abralon with Factory Polish Finish.

Versatile drilling is another option that allows you to opt for various bowling preferences.

Making a high score is a matter of time only. The bowling pros admire the strong back end reaction of this ball. It retains energy in proper motion. As a result, the ball has devastating energy that blows the pins away.

It has a medium RG, and you can read the pace of the ball when it is on the mid lane. Also, it can eliminate over or under reaction during the rolling process.

This is an unstoppable ball that hits the pins on the deck like the best benchmark bowling ball. Do not worry if you find a more vigorous motion while rolling down the ball. Still, you will have control over the line of the ball.

Angular motion down the lane is another advantage that you must have to admit. The back end of the ball comes with incredible power and hits the breakpoint effectively.


  • Perfect transition
  • Suitable for low rev bowlers
  • Shines in different conditions
  • Firm control over the ball


  • Less comfortable in a dry lane
  • No other disadvantages found

2. DV8 Turmoil 2 Solid Bowling Ball

Are you playing a league tonight? You need luck with the DV8 Turmoil 2Solid Bowling Ball.

Are you Surprised? Don’t be. This bowling ball comes with a perfect balance of its core and cover. The outer shell (or coverstock) is solid and allows you to react while rolling down.

When you need some typical shots, rely on this bowling ball. It performs very well on the lighter hits. However, you may see some changes in the performance when the hit is a bit heavier.

If you want to dominate the scoreboard on the league night, don’t you need a versatile bowling ball?

Nobody will disagree on this particular point. When you will split 8-9 pockets, how would you feel? It will remain hidden that what was your style or how you took the shot all the time. When you have this DV8 Turmoil Solid Bowling Ball, you are the winner.

Experts prefer this ball as it has better performance than its ancestors. Solid symmetry is an added advantage, and it is 500/ 4000.

The performance of the ball is up to the standard in various bowling conditions. Slight angular motion can ensure your victory in the leagues.

Also, it has an extraordinary look. The stiff structure, smooth continuation, and predictability – all are advantageous here.


  • Super predictable
  • Solid construction
  • Versatile application
  • Big motion


  • Needs perfect drilling
  • Colors too bright

3. 900 Global Boost Bowling Ball

Can you explain in brief that what is an essential part of a bowling ball?

Well, the answer may vary. But to me, it is the coverstock. Many of the pro bowlers consider the coverstock before anything.

This symmetric 900 Global Boost Bowling Ball comes with S43 pearl coverstock. It has a 1500 Grit, and that is polished.

Therefore, the bowling ball provides the right length on different oil conditions. If you need the back end breakpoint, this is the right weapon for your bowling arsenal.

The manufacturer takes humble pride for its superior performance in drier conditions. No matter if you are a beginner or a pro, you can perform naturally with this reactive ball. For the symmetric core, there is a snap in the back end.

Sharp turn on the back end is another plus in this bowling ball. For the turning, you can roll down the ball at the right angle to hit in the pin deck. Controlling the ball during the rolling is almost effortless.

Drilling it at any corner is possible. The smooth head significantly changes the direction in the last part of the alley. The friction of the ball takes it directly towards the pocket without any overreaction.

Do you love to see your bowling ball exploding energy? You can have it on this ball. You can consider this as the best hammer bowling ball. The readable motion is another plus with this bowling ball. If you are a straight player, you need not chase the pattern. The ball will do that for you.


  • Clean, controlled motion
  • S43 Hybrid shell
  • Perfect pin hitting
  • Color available


  • No visible cons available

4. Pyramid Clear Skull Bowling Ball

Pyramid Clear Skull Bowling Ball
Pyramid Clear Skull Bowling Ball
  • Skull Design Core Visible From Outside
  • Clear Polyester Coverstock
  • Finely polished for striking design visibility and clarity

Are you a hook lover in your leagues? Well, this symmetrical Pyramid Clear Skull Bowling Ball is the perfect combination of strength, pace, and explosion.

The most impressive aspect is that it comes with a visible skull design. Don’t worry; it will not create panic among your mates in the bowling alley.

Interestingly, the coverstock is from clear polyester, which ensures the visibility of the skull. Also, you will enjoy the feature of this polished bowling ball. It reaches straight to the pins and strikes them like the hammer bowling balls.

This bowling ball gained popularity among the pro players for its classic feel. With the exclusive design, you can see the core. Or, if you want to be the center of attention, it’s the right bowling ball for you. It rarely misses the pins on a lengthy deck. With an average strike, you can reach your target.


  • Cool performance as spare ball
  • Hits effectively
  • Clear look
  • Fine polishing


  • A bit fragile
  • Coating damage

5. Radical Counter Attack Solid

Are you a hard-core bowler?

Radical Counter Attack Solid is the last best symmetrical bowling ball in this review list, and you can pair it for extreme hits.

It comes with Core Rack Attack 2 Symmetric with the combination of Ai-20 solid coverstock. Also, you can have finishes like 500, 1000 and 3000 Siaair.

Do you how this bowling ball performs? It reaches in the hooking motion right after crossing the mid lane. The ball can perform better in medium-heavy conditions. And if you are a beginner, you can easily flat the pins on the deck with a simple shot.

The design of the ball lets it cover all the pins with a massive explosion in the end. The cover stock formulation is another plus in this bowling ball.

Though the design is a bit similar to its ancestors, there are some subtle changes. The ball rolls down smoothly to the alley. The continuation of the ball is smooth, and it goes through the pins effectively.

When you play in lower volume but want to control the lanes, this is the right bowling ball for your arsenal.

It has lots of friction but with smooth power generation. The ball motion is attractive and can handle the oily surface in a better way. The ball moves naturally with a smooth transition.


  • Ai 20 coverstock suits oily surface
  • Natural progression
  • Efficient transition
  • Explodes after crossing mid lane
  • Follows exact pattern


Symmetrical Bowling Balls vs. Asymmetrical Bowling Ball

It’s a matter of debate that which one is the best – the symmetrical bowling ball or the asymmetrical bowling ball.

Did you ever ask your mates what that means? Most of us don’t.

If you seek my opinion, as a bowling expert, I would rather say that both bowling balls are necessary. They have their respective features and advantages. Do you want to know which one suits you? Well, then you need to know the critical difference between a symmetrical bowling ball and an asymmetrical bowling ball.

Here they are.

1. Small differential ratio

The symmetrical bowling balls have a small differential ratio. For the small differential ratio, the ball provides a smooth motion. Also, you can control the motion easily.

On the other part, an asymmetrical bowling ball has an angular motion. They have a wide breakpoint and responds to friction quickly.

 2. Weight block shape

Usually, an asymmetrical bowling ball has a well-balanced shape. The weight block of the ball is balanced.

But an asymmetrical bowling ball is different. The weight block is centered on any particular position.

Symmetrical weight blocks are shaped like a light bulb.

But the asymmetrical weight blocks have a different look. It appears they are spreading their arms.

3. Difference of cores

There is a slight difference between symmetrical and asymmetrical cores. Usually, the radius of gyration (RG) in asymmetrical cores differ over 5 percent between the high and low axis.

But in the symmetrical core, the RG differential is lower than 5 percent.

There are many more differences available between a symmetric ball and an asymmetric ball. But now, I am giving up the debate here, and we shall discuss the matter in a future post.

4. Hooking Potential: 

An asymmetrical bowling ball provides high hook potential. Thus it is called an aggressive bowling ball. 

Symmetrical bowling ball is specially designed for low hook and controllable motion

Frequently Asked Questions

1. How does RG affect a bowling ball?

The radius of Gyration (RG) is a measurement of the bowling ball. It gauges the distance from the axis of rotation.
The bowling balls with a higher RG number has extensive length. But the bowling balls with lower RG numbers can move faster and hook within a short time.
So, if you want to hook early, you need to have the bowling ball with a lower RG number. But if you want more length, you should prefer the higher RG number.

2, Who need symmetrical bowling ball?

Bowlers preferring a more stable and continuous motion, select the symmetrical bowling balls. When you need a durable ball reaction from the mid lane, you need not select the symmetrical balls.
But if you need a less aggressive ball with hook potentials, the symmetrical bowling balls are for you.

3. Who need asymmetrical bowling ball?

Bowlers who need an aggressive movement in the bowling alley, prefer asymmetrical bowling balls. They are reliable and perform in heavy oil conditions where there are fewer frictions. They have high hook potential. If you are a big hook lover with great control, asymmetrical bowling ball is for you.

4. Which oil lane works best for symmetric bowling ball?

Generally, medium to dry lanes is the perfect ones for the symmetric bowling balls. In the medium bowling alley, there are fewer frictions with the cover stock. So, the ball can skid perfectly and reach the deck to hit the pins.

5. Which oil lane works best for asymmetric bowling balls?

An asymmetric bowling ball can work in different soil conditions. But it plays a better role when you roll the bowling ball on a heavy oil condition.

Final words

How are you feeling now after going through the long texts?

I hope you have the right idea about Best Bowling Balls. Both versions of symmetrical and asymmetrical bowling balls have their distinctive features and application. So you have a variety of options from where you can select the best bowling ball for yourself, your friends and family members, But remember, they will work perfectly when you have the right way of hitting.

If you need the best benchmark bowling ball, but you lack the skill, you cannot have the best result. Among many other preparations, you need to have the best bowling ball that suits you.

So, I can say you need to practice a lot—practice, practice, and practice.


Storm Introduces the Vector Layout System

When Storm introduced the PSA Drilling Guide in 2005, drilling instructions for balls with a strong preferred spin axis, it was met with a variety of reactions, ranging from “What is a pin buffer?” to “Ah, this explains it!” This guide introduced the Pin Buffer System of laying out balls, which helped bowlers position the pin and PSA in different orientations relative to their PAP.

To understand the Pin Buffer System, one must understand the effects of three critical components. The distance of the pin to the bowler’s initial PAP controls the amount of total flare. The PSA to PAP distance dictates how quickly the ball loses axis rotation (side roll). The pin to VAL distance, also known as the pin buffer, controls the shape of the hooking motion at the breakpoint.

Knowing the layouts, such as 4 x 4 x 2, doesn’t help one understand what decisions were made in order to arrive at that particular layout choice. Hence, we created the VLS, or Vector Layout System.

Nearly five years in the making, the VLS was developed to help users from the pro shop professional to the bowler who has more than one bowling ball. It will also help coaches and proprietors in that it plainly walks one through a series of questions and then calculates the proper Pin Buffer System layout based on the information given.

The powerful yet simple VLS is an easy-to-use program which runs on any version of Excel. And for you Apple users, no worries: there is a free app you can download called CloudOn which will allow you to open, modify, and navigate through the VLS both quickly and easily.

What follows isn’t light reading. Feel free to grab a few Advil now; you can thank me later!

The Vector Layout System

Historically, we have created layout systems that make good generalizations concerning ball motion using only the PAP. However, technology has evolved in such a way that we can further fine-tune ball reaction by using precession to our advantage. Understanding physics and vectors can help us understand why a ball changes direction, but application isn’t easy. That’s why Storm developed the VLS. (See Figure 1A)

An easy-to-use spreadsheet is available free of charge to the public on beginning June 1. VLS works off a series of drop-down menus that allow it to calculate the proper layout. It takes into consideration the desired ball motion and bowler statistics, as well as the specific RG planes of the bowling ball chosen.

Let’s take a quick look at the lane conditions section, called “Pattern Details” in the spreadsheet. If you click on the right side of that column, you will see the different categories come up. Ranging from very short to very long, you can choose from a variety of pattern lengths (in feet.) (See Figure 1B)

figure 1a

Figure 1A

Figure 1B

Figure 1B

The methodology for the VLS was done with this same ease-of-use in mind. Answer each of the questions and you’ll be able to see the recommended layout for any bowler, with any ball, for any lane condition. While, of course, we hope that you are partial to Storm and Roto Grip, we decided to make this program available to the entire market in hopes of making better bowlers and pro shops everywhere.

The early testimonials have been astounding! Erik Ramos from Orlando, FL drilled a Lucid for one of his customers who typically has not had much success with asymmetricals due to his high rev rate. This customer has a tendency to drill every ball with a 5 inch pin to PAP below the fingers. Erik tried the VLS the day of our seminar and found that 2¼ x 5½ x 1½ was a good choice. His customer’s first game that night? 300! His series the next night, with the ball he wouldn’t ordinary choose and a layout he definitely would shy away from? 802!

Nick Morgan from Sacramento, CA had a similar story. Game one with the VLS was also 300.

We mentioned earlier that the key to this new system is based on working with the designed RG planes of a particular bowling ball.

Understanding RG planes

You are likely familiar with the term radius of gyration (RG). The RGs are published in the technical data cards and on the box of every Storm ball. By definition, the RG is the distance from the axis of rotation at which the total mass of a body might be concentrated without changing its moment of inertia. The approved RG range for bowling balls is 2.46 to 2.80 inches from the geometric center of the ball. A low RG value indicates the center of gravity is close to the center of the ball, allowing it to rev up more easily, increasing total ball motion.

While this number represents a distance, manufacturers generally do not include the unit of measure. If you look at Storm’s website, you’ll find that the Sync, for example, has an RG of 2.47. This measurement indicates the lowest RG value of that undrilled bowling ball which is the RG of the ball about the pin.

Keep in mind that there are an infinite number of axes that exist and can be measured in any sphere. To better understand RG planes and how they relate to our sport, we’ll focus on three primary axes: X, Y and Z. They represent the minimum, intermediate, and maximum RG values. We have to understand these three main positions before we start filling in the areas in-between and around these points with the varying RG planes.

Looking at Figure 2, you’ll notice that we marked and referenced the pin as the X axis. Since that position is about the pin, that particular RG value is found in only one location in our reference area. In this example, the RG value about the X axis is 2.53.

figure 2

Figure 2

To determine the RG values about the Y and Z axes, we would first need to know if the core or weight block is symmetrical or asymmetrical. When the internal shapes are symmetrical, the RG values about the Y and the Z axes are identical. The actual value can be determined by adding the amount of differential to the RG. The technical data shows that in a 16 pound ball, the differential for the Freak’n Frantic is 0.044. Adding the two together (2.53 and 0.044), you can calculate the RG about both the Y and Z axes to be 2.574.

It’s not just at these two points the RG is 2.574. The RG can be measured all along the white arc connecting the Y and Z axes. Doing so will confirm that the same RG value is present all across the arc. We now have what’s called an RG plane.

When describing the RG planes of balls with a symmetrical core shape like the N.O.S. core found in the Frantic series, the image of the globe works as a terrific example.

Looking at Figure 3, consider the X axis to be the North Pole. Both the Y and Z axes would lie upon the equator. For 16 pound balls with the N.O.S. core, the RG at the North Pole is 2.530 and the RG at all point along the equator is 2.574.

figure 3

Figure 3

What about the rest of the ball? There are countless arcs and points that lie between the North Pole and the equator. You can see the lines of latitude as indicated by the blue and red lines. We’re concerned only with the blue lines in figure 3. Nothing against South America and Australia (great bowling areas, by the way), but when looking at a bowling ball and trying to manage the axis migration and the bowties, we only need to address the Northern Hemisphere!

Looking at these points in-between, we can measure the RG value at any position. If you were to measure and map out the positions which had similar values, you would find a series of arcs which are circular about the pin and which extend 6¾ inches away to form the equator. These arcs would look just like the blue lines of latitude on the globe as seen in Figure 3.

If you were to use a compass to trace out these arcs, or planes, you would see that at, for example, four inches from the pin, the RG will stay the same all 360 degrees around the ball. Figure 4 shows you the RG values for each plane between the pin (X axis) and the equator (largest plane containing Y and Z axis).

figure 4

Figure 4

Just as a side note, the X axis extends through the sphere at two different points on the surface of the ball. So, the RG value about the South Pole would be the same as the North Pole, but until you start mapping out balls based on the position 13.5 inches from the indicated pin, you won’t need to worry about that.

Now that you understand the specifics of RG values, RG planes, and how they are distributed on a symmetrical bowling ball, let’s talk about the difference with the same planes on an asymmetrical ball. It’s a whole new ball game!

Contrary to the RG planes in an undrilled symmetrical ball, an asymmetrical core produces RG planes which are not of uniform distance or shape about the pin (X axis). The planes on a Sync, which features the G2 core (Figure 5), look nothing like the image of the globe.

figure 5

Figure 5

Looking at Figure 5, we can see following any one color takes us along a different shape or path. The shapes about either the pin or the PSA are oval, while the arcs in between are slightly concave or convex. RG planes that look like this indicate the weight block is asymmetrical by design and will have a faster spin time and quicker transition on the lane. Look for these types of balls to produce a stronger reaction, especially for those with low to medium rev rates.

Migration paths

In the old days, ball tracks were a single, thin line of oil or wear that never moved. You could easily identify the most consistent, and often best, bowlers in the center as those with the narrowest ball tracks, which was a sign of a repeatable release. Today, you’ll notice that a bowler has several rings of oil due to the imbalance of the weight block.

Bowlers used to have just one positive axis point, or PAP. What is known as a bowler’s PAP is truly their initial PAP, the point on a ball about which the ball rotates initially upon release. After the first revolution, this position will change, as indicated by the flare rings.

What you see here, as we map out the actual PAPs of differently drilled balls, is that these migration paths vary in both shape and total distance, an indication that a different type of ball motion is being produced as a result of the different core orientation and applied physics. Get ready for some fascinating stuff!

We started by drilling three different Storm Syncs, all with 4 x 4 layouts, but with different pin buffer distances. As we plot the migration paths, notice they each produced different amounts of total flare as well as different path directions.

You can see from the picture in Figure 6 that by simply adjusting the pin buffer distance, we can significantly alter the migration path relative to the grip center. In addition, as you might expect, we changed the breakpoint location and transition shape/length in doing so.

figure 6

Figure 6

Starting at the left side of Figure 6, the 4 x 4 x 0.5 layout produced the earliest breakpoint and the shortest transition length. This means our testers would line up deeper with their feet in order to hit the pocket. The transition length can be described by how arcing or snapping the motion is when it sees the dry boards. Many people prefer a hockey stick type of shape that really turns the corner (upward direction). On sport conditions, one looks for more control (downward direction).

CATS (Computer Aided Tracking System) graphical analysis – VLS in action

To help understand the Vector Layout System more thoroughly, we drilled the Sync with three different layouts for two different players: one was a tweener with a medium rev rate and axis rotation, and the second was a cranker with a much higher rev rate and an extreme amount of rotation.

We chose three layouts with both the pin to PAP and PSA to PAP measurements identical, but with three different pin buffer differences. All three pin distances from the PAP were identical so as to theoretically produce the same total flare, but we varied the pin buffer distance to alter the migration shape and, thus, ball motion.

Using CATS, the graphical analysis of our medium rev player (Figure 7), shows three different ball paths. The 4 x 4 x 2 layout finished high flush, while the other two finished either high or light. Remember, everything was identical with respect to coverstock, surface preparation, pin to PAP, etc. The only thing that changed was the pin buffer (the distance from the pin to the VAL).

figure 7

Figure 7

The graphical analysis seen in Figure 8 shows the three different ball paths for our higher rev player. The 4 x 4 x 3.5 layout finished extremely high flush, while the other two finished either Brooklyn or right in the heart of the headpin. With the higher rev rate, we saw greater separation in the ball paths due to the increased hook potential.

figure 8

Figure 8

If you throw the ball perfectly end-over-end, it will roll on a straight line. When you apply some side rotation, layouts and ball selection become much more critical. That’s why you will always see more ball motion with increased axis rotation. Revolutions only help increase hook when side roll is applied!

Post-drilling axis migration — understanding the three main paths

The direction of the migration path is related to the location and shape of the breakpoint. As you noticed in Figure 6, the three main paths can be described as:

Balls which have migration paths in the upward direction, more toward the fingers, will have pins closer to the VAL. This orientation produces the fastest transition (the part of the ball path known as the hook zone, and represented by a curve), the sharpest breakpoint, and yields the most entry angle. If you want this type of motion, be sure to select the short transition length in the VLS tool. It works well on certain lane conditions, but lets you know immediately when it’s time to put it back in the bag!

The 4 x 4 x 2 layout yields a migration path which goes straight across, often toward the grip center. This is a benchmark type of layout which is very popular due to its versatility. Bowlers often like balls which migrate straight across since they produce a higher amount of flare potential, without being extreme one way or the other in transition length.

Lastly, balls with migration paths that move in the downward direction, more toward the thumb, will have the longest transition length. These balls will tend to be more arcing in nature. This type of path is achieved with larger pin buffers, often with pins placed below the fingers and PSAs kicked out to or past the VAL. These layouts work better on shorter oil patterns that require more control and predictability.

People to thank

The VLS by Storm was developed with the assistance and cooperative efforts of many people, including Hank Boomershine and Victor Marion of Storm Products, Chris Forry and his entire staff at Buddies Pro Shop, Weber State University Professors Collin Inglefeld and Ronald Galli and their physics department, Don Hogue, and Mark Malinovsky.

Storm is committed to supporting competitive bowlers and pro shops worldwide. Offering emerging technologies like the Vector Layout System to the bowling world free is just one way Storm can give back to the community. I hope that you will find it to be an important tool in the decision-making process of laying out and drilling your equipment.


Ball layouts storm asymmetrical bowling


All information provided by Storm Bowling Products

 Ambient Temperature - Temperature of the surrounding area; same as room temperature.

Approach - The area immediately in front of the lane before the foul line measuring at least 15 feet in length and not

   less than the width of the lane.

Approved- Used to describe equipment that has been sent in, reviewed, tested and found to meet all current

   specifications at the time of approval.

ASQ- American Society for Quality.

ASTM- American Society of Testing Materials.

Asymmetrical Core (undrilled)- A ball where the RG (radius of gyration) values of the Y (high RG) and Z (intermediate

   RG) axes of the ball differ by more than 5% of the total differential of the ball.

Axis migration- Path of which the axis point travels across the surface of a ball as the ball travels down the lane; this

   path will always have the approximate same RG measurement as the ball travels.

Axis Point - One of two points located on opposite poles marking the end points of the axis of rotation.

Axis of Rotation - An imaginary line, perpendicular to the track, along which a bowling ball rotates.

Axis tilt - The measurement of the vertical angle through which a ball rotates; tilt is synonymous with the amount of

   “spin” a bowler has.

Back End - The angle or degree of hook at the breakpoint. Back End is not where the ball hooks, but how much it

   hooks when it hooks.

Balance Hole - An extra hole drilled in a specifc position in the bowling ball. This hole is used to balance the ball

   statically and alter the overall reaction of the bowling ball.

Ball Speed

  Slower - initial velocity is less than 17mph

  Medium - initial velocity is between 17mph and 19mph

  Faster - initial velocity is greater than 19mph

There is a formula to calculate a player's velocity:

  1. Determine the elapsed time (in seconds, i.e. 2.52) from the moment of the player's release to the moment of

      impact on the pins.

  2. Divide this number into 40.91 (i.e. 40.91/2.52 = 16.23 mph).

Ball Track - The portion of the bowling ball, which comes in contact with the lane as it rolls down the lane.

Bifilar - The use of two cords or wires to support the test cradle in testing the radius of gyration of a bowling pin. 

Break Point - The portion of the lane where the bowling ball completes its transition from skid to traction, and provides

   the greatest amount of hook. This generally occurs in the last 20 to 25 feet of the lane.

Carry-down - Refers to the oil that travels to the previously-dry backends. This condition results in less overall hook.

Center of Gravity (CG) - The position in which the ball is evenly balanced statically in all directions. This is usually

   indicated by the position of the logo or punch mark.

Certified - Any competition, bowler, league, center or coach that is registered with USBC.

Coefficient of friction, COF - The ratio of the force opposing the relative motion of two surfaces and the normal force

   acting perpendicular opposing force. In bowling, this term usually defines the interaction between the coverstock,

   lane conditioner and lane.

Coefficient of restitution, COR - The ratio of the energy of two objects after impact to the energy before impact. In the

   case of a ball striking a pin, this is the percentage of energy transfer from the ball to the pin.

Conventional Grip - The method of drilling in which the fingers are inserted to the second knuckle.

Core (aka: Weight Block)- The large, round inner portion of a three piece bowling ball. This area consists of the filler

   material and may have other high-density materials for dynamic purposes.

Core Torque - The mass distribution within the arms created by the core (or weight block). Core torque is an assigned

   value of the ball's ability to combat rollout, the complete los of axis tilt. High torque balls are more effective than

   lower torque bals at delaying "rollout". High torque balls will also tend to react more violently on the backend than

   lower torque balls, which roll more even, displaying a more predictable transition from skid to roll.

Coverstock - High rev rate...a player that prefers to play the swing shot, throwing the ball towards the gutter looking for

   a big, late backend reaction.

Crack- A partial break or split, slight or narrow, which appears on the surface of the ball. Also referred to as “stress

   fractures” which often occur around thumb or finger inserts or through the bridge area between the finger holes; a

   cracked bowling ball is not automatically disallowed from use in certified competition.

D-Scale - Refers to an instrument (Durometer) used to measure the hardness of the coverstock of a bowling ball.

Differential (of Radius of Gyration) - The difference of the radius of gyration of a bowling ball's X axis (the weight block

   vertical) compared to the radius of gyration of the same ball's Y or Z axis (the weight block horizontal). Differential is

   an indicator of a bowling ball's track flare potential. Bowling balls with lower differentials are more stable, therefore

   generating less track flare potential. Bowling balls with higher differentials are unstable, therefore generating a much

   larger track flare potential. Also, differential is a guide to the internal versatility of a ball. It can indicate just how much

   of a length adjustment can be made through drilling. Balls with lower differential will allow only modest length

   adjustments whereas balls with higher differential may translate into a length window of up to 5-times that of low

   differential balls.

Dull - The surface of a bowling ball appearing without reflection (synonym - Sanded)

Flare - The migration of the ball track from the bowler's initial axis (the axis upon release) to the final axis (the axis at

   the moment of impact with the pins). Flare is a length modifier. Flare is used to expose fresh, dry ball surface to the

   lane surface, the entire length of the lane. While on oil, this means little to the performance of the ball, but when the

   ball crosses from the oil to the dry, the dry ball surface bonds with the dry lane surface to increase friction which

   causes earlier hook and greater overall reaction.

Flare Potential - The maximum amount that the axis of a bowling ball can migrate given the construction of the ball

   provided that the bowler has a miximum power release. Flare potential can also be used to indicate which balls will

   be better suited for oily conditions (high flare balls) and which balls will be better suited for dryer lane condtions (low

   flare balls).

Friction - The energy released upon the bowling ball contacting the lane surface causing the transition from skid to roll.

Grit - Pertaining to the texture of the surface of the ball, whether polished or sanded.

Heads - The portion of the lane, which extends from the foul line, past the arrows, and to the pine. Usually, this is

   assumed to be the first 20 feet of the lane.

Hook Potential - Refers to the number of boards one ball will 'cover' relative to another.

Lane Oil/Conditioner - Substance that was developed to reduce friction between the ball and the lane, with the ultimate

   goal of protecting the lane surface. It also allows the ball to skid down to its desired roll and hook point, and its

   placement can greatly affect scores.

Length - An evaluation of how far a ball will travel before it begins to hook. Length does not include skid caused by

   laneconditioner, additional fine sanding, or the use of polishes.

Leverage Point - The position located 3 3/8" from the bowler's positive axis point (PAP). Positioning the mass (or pin) of

   a bowling ball on this point creates the most track flare and over all hook of a bowling ball.

Mass Bias - The position in a bowling ball, other than the pin, where the mass is closest to the outside circumference

   of a bowling ball. Mass Bias appears only in "pin out" balls. The offsetting of the weight block tilts the mass to one

   side creating a center of gravity away from the pin. There is now "Mass Biased" to one side of the ball.

Midlane - This is the middles part of the lane past the heads (1st 20 feet of the lane) and before the backends (last 20

   feet of the lane).

Midline - A horizontal line half way between the fingers and thumb.

Midplane - A line perpendicular to the midline that extends through the positive and negative axis points. This line

   divides the top and bottom halves of the ball on the bowler's axis of rotation.

Oil Patterns - The way oil is distributed onto the lane. Here are the most common used in bowling centers:

Top Hat - Heavy oil in the middle and very light on the outside

Christmas Tree - More oil in the middle than the outside. Tapered to the outside throughout the entire pattern

Sport - Permits ration of 3:1 oil from inside to outside portion of the lane. Used on PBA Tour.

Flat - Same amount of oil applied across the entire lane

Reverse Block - More oil applied to the outside boards than in the inside

Particle - Relates to coverstocks, particle technology consists of small units of various materials added to the shell. Particle coverstocks provide increased traction in the oil.

  Pin - A small factory plug that signifies the center of the weight block in most bowling balls.

  Pin In - Refers to the weight block being centered in the ball. When this occurs, the pin is within 1" from the cg.

  1. Pin and Center of Gravity (CG) are together on ball.

  2. The weight block is perfectly center in the ball. 

  Pin Out - Refers to the weight block not being centered in the ball. When this occurs, the pin will be more than 1" from the cg.

  1. Pin and CG are not together.

  2. The weight block is not perfectly centered in the ball.

  3. This offsetting of the weight block tilts mass to one side creating a center of gravity away from the pin.

  4. We now have "Mass Biased" to one side of the ball. 

Pines - Generally referred to as the middle 20 feet of the lanes. Actually, on wood lanes, it represents the 45 feet

  between the arrows and the head pin.

Positive Axis Point (PAP) - The point on the pocket side of the ball that is at the end of the bowler's axis of rotation

   upon delivery.

Preferred Spin Axis - The axis which a ball desires to rotate around, and which it flares to achieve this rotation.

Radius of Gyration (RG) - An account of the location of the mass inside a bowling ball. Rg tells us whether the ball has

   the mass toward the center of the ball (low rg), toward the cover of the ball (high rg) or somewhere in between

   (medium rg).

  1. Low rg balls rev up quickly.

  2. Medium rg balls rev up slightly later.

  3. High rg balls lope down the lane saving the energy until later. 

RAD - Radial Accelerating Dual Density Disk. When combined with a strong reactive or particle shell, this

   asymmetrical design produces a very aggressive ball path.

Reactive Urethane - A coverstock comprised of similar materials used in urethane formulations, however blended with

   different additives. This coverstock adheres to lane surface, creating the most backend reaction, the least deflection

   and the most hitting power of any coverstock manufactured today. * Revolutions - The number of times in which the

   weight block makes one full rotation around the axis line, as it rolls from the foul line to the head pin.

Rev Rate - A player's Rev Rate will relate to selection of differential, or Flare Potential, for that Particular Condition!

  *To Calculate a Player's Total Revolutions:

  1. Place a stripe of tape from the player's axis point to their ring finger.

  2. Count the revolutions between the player's release and the arrows.

  3. Multiply this number by four (4). 

  Slower Rev Rate = Stroker - up to 11 revolutions

  Medium Rev Rate = Tweener - from 11 to 17 revolutions

  Faster Rev Rate = Cranker - greater than 17 revolutions 

Scotch-Brite - This is an abrasive that is used to scuff or sand the ball surface to create different ball reactions or used

   to resurface the ball cover after the wear and tear from use. We recommend these three types of grits:

  1. Burgundy - this is the roughest and equates to 240-grit sandpaper.

  2. Green - this is the medium textured pad and it will produce a 500-600 grit finish.

  3. Gray - this is the smoothest and finest grit pad. Will adjust the surface to an 800 finish. 

Skid/Flip - Refers to a ball reaction that results in excessive backend reaction and increased entry angle.

Stroker - Slow rev rate...a player that will play the lanes 'down and in' covering very few boards.

Static Weights - (top, side and finger): Fine tunes ball reaction.

Surface - The composition of the outside of the bowling ball. Also refers to the texture of the coverstock of a bowling


Three Piece Construction - A bowling ball constructed of three elements: the coverstock, the filler material, and the

   high-density puck.

Two Piece Construction - A bowling ball constructed of two elements: the coverstock and the weight block. A modified

   two piece bowling ball has the same basic characteristics of a two piece ball, only the weight block has been

   modified to change the dynamics of the ball (i.e. dual density weight block).

Tweener - Medium rev rate...a player that likes to belly the ball slightly, but prefers a fairly controllable reaction overall.

Urethane - A coverstock comprised of material from the polymer family which creates a hard, durable surface on the


Weight Block - The inner portion of a two piece (or modified two piece) bowling ball which influences ball reaction

   based on its density and position to the bowlers axis.


A paved path led to the house, framed by a dried-up lawn, from which here and there were sticking out shrubs and withered trunks of trees. It's good that the sun almost did not hit them because of the shadow of the mountains, otherwise a fire could break out. Oddly enough, the door opened silently, although.

Similar news:

There was no expression on her face, as if she was sleeping with her eyes open or was drunk. However, in such heat, any dose of alcohol could have a powerful effect. I was also surprised by the lack of a handbag in the girl's hands, it seemed to me that they did not go anywhere without their. Cosmetic bag, and it was hardly possible to carry a lot in the pocket of narrow shorts.

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