Ball NPS Score: Not Available
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The look and performance of this high-performance bowling ball make it nothing less than a Gem. The Roto Grip Gem introduces us to the Defiant LRG core which is the lowest RG asymmetrical core in the current Roto Grip line-up. This core enables the ball to rev up fast and continue strong! Not only is the core in this ball noteworthy but the coverstock is the extremely aggressive MicroTrax Solid Reactive. This powerful combination makes this bowling ball perfect for heavy oil conditions.

Color: Citrine/Ruby/Amethyst
All colors do vary somewhat from the picture shown
Coverstock: MicroTrax Solid Reactive
Core: Defiant LRG (14-16#)
Finish: 2000 Abralon
RG: 2.47 (for 15# ball)
Differential: 0.053 (for 15# ball)
Recommended Lane Condition: Heavy Oil
Hook Potential: High
Length: Middle

The Roto Grip Gem features the extremely low RG Defiant LRG Core wrapped in the MicroTrax Solid Reactive coverstock. The RG at 15lbs is 2.47 with a differential of .053 and an intermediate differential of .016. This ball is all sorts of strong…it is strong in the front, the mid, and still has some left for the backend part of the lane, not to mention the strong shelf appeal of this beauty. This ball is great for bowlers who are speed dominant or low rev players. The low RG core gets this ball rolling as soon as it hits the lane, so oil in the front part of the lane is a must for the Gem. For me the box finish of 2000 grit abralon was too much. I had to get some games on this ball just to tame it down somewhat so I could really use it at my home center. For me this ball is different than all the current SPI brand asymmetric balls. The Gem is much more of a heavy rolling ball with a very smooth backend. It is something that I will use on longer and flatter conditions where I need to keep my angles closed. If you are looking for a ball that handles the oil like no other, look no further than the Roto Grip Gem.

Roto Grip Gem Review

Rev Rate: 375
Ball Speed: 15-16 mph
PAP: 5 inches over, 1/2 inch up
Layout: 55x5x65



(I have attached a link to the Gem Ball Review that I did on YouTube. Feel free to check it out!)

https://youtu.be/EwlJDyjYFps

The Roto Grip Gem is a tank on the front lines of driving through oily league and tournament conditions. The Defiant LRG core gives it a faster revving asymmetrical look with its 2.47 RG, while the MicroTrax solid reactive coverstock gives it that extra aggressiveness to handle any medium to heavy oil conditions. This ball will have no problems getting uphill. The Gem will “dazzle” for you!

Gem • Performance Line • HP4
Core •Defiant LRG Core
Coverstock • MicroTrax (Micro Nanoparticle Traction) Solid Reactive Finish • 2000 Grit Abralon
Weight • 15 lbs. RG •2.47 Differential • .053 Int. Diff • .016
Layout • 4 x 5 x 2 1/2
Tester PAP • 5" R, 5/8" D Tester Axis Tilt • 11° Tester Rev Rate • 325
Test Pattern • 42' THS (Typical House Shot) • Modified, Kegel Stone Street

There is truth to the statement, "Sometimes evolution can spark new life into technology." And with the release of the Gem, Roto Grip has sparked a brilliant new dimension into their HP4 line. With the Defiant LRG Core and MicroTrax Solid Cover combination, the Gem delivers a powerful, cutting-edge new look to your ball motion. So let's break it down on a THS!

The heart of the Gem is the Defiant LRG Core. And I loved how this core reacted from the first shot! The Defiant LRG Core rev's smoothly and earlier like you would see in a strong symmetrical core. However, when it makes the turn and stands up, it enters the roll phase with a rolling thunder of power! So if you are a straighter, low rev player like me, this core is ideal for your game! And what I found most appealing about the Defiant LRG was although, being it is a low RG core, it flared (hooked) more than expected. Yet it also delivered an impressively powerful continuation through the pins! So down and in, players will love the Defiant LRG's potential to dispense those frustrating ten pins even without having six degrees of entry angle!

The MicroTrax Solid reactive cover is well-suited for straighter and down and in players. And being the MicroTrax is a strong solid cover, you can count on its teeth to bite into heavy oil! Yet, although it is an aggressive cover, I found the MicroTrax Solid didn't overreact to friction. I saw a smooth transition coming off the pattern on fresh oil playing the nine board. Then as the THS pattern began to break down, I liked how this MicroTrax cover blended the wet/dry conditions that developed. And as a straighter player, I enjoyed moving my target in decisively without worrying if I had enough hand to make the Gem turn off the pattern! The MicroTrax cover gave me the confidence to stand left while still retaining the Gem's intense hitting power.

In closing, I was impressed with this new release from Roto Grip! The Gem performs brilliantly for down and in players and those with a challenged rev rate! And with the Defiant LRG's asymmetrical core and the MicroTrax Solid reactive cover, the Gem will be a powerful tool to add to your arsenal. So have your local pro shop operator drill yours up and tweak the Gem's surface today, then see for yourself why the Gem is the jewel in your arsenal!

Rick Klimowicz
Storm Products Pro Shop Staff
Roll the Ball Pro shop
Penndel, PA

Roto Grip's new high performance bowling ball the new Gem! This ball features the Micro Trax Solid Reactive Coverstock wrapped around the Defiant LRG Core.

 

If you are looking for a ball to tackle the heavier oil conditions, look no further, this ball just flat out hooks. It starts picking up a roll very early like most heavy oil balls, but where this ball stands out, the recovery on the back end. Most hook balls for me, use so much energy up front, there isn't much movement on the backend, leaving a lot of corner pins. This ball still has enough energy on the end that it snaps them out.

 

It also takes surface adjustments very well, as I shined it up just see how it would react, I was not disappointed. With shine, it cleared the heads very well, picked up in the mid-lane very well, and had plenty of backend. What impressed me most while shiny, was when I missed to the dry early, it did not jump off the spot, but rather a smoother reaction to the pocket.

 

Don't miss out on one of the biggest hooks balls on the market right now in the Roto Grip Gem!

Ball Specs:
Roto Grip Gem
Coverstock: 2000-grit MicroTraxâ„¢ Solid Reactive
Weight Block: Defiantâ„¢ LRG Core (Asymmetrical)
Color: Citrine/Ruby/Amethyst
Review:
The Gem is a very vibrant, very strong, very early rolling ball. This ball reminds us of the Reality and the Proton Physix. This ball will be a monster on a fresh house shot. It seems to recover very well if you push the ball to the right so we really can move our feet left and open up the lanes. This ball is also a gem when it comes to continuous motion, and is very noticeable right off the bat. If you are looking for a first out of the bag asymmetrical ball that is very strong and very continuous look no further.

Kyle, Joel, & Dean Johnson
Roto Grip Pro Shop Staffers
joel@parklanes.net
kyle@parklanes.net
dean@frontierfuncenter.net
www.RotoGrip.com
#SquadRG

Lane Condition
Length: 40
Volume: Medium
Type (THS, Sport Pattern etc): THS

Comments
The Gem is possibly the strongest ball in the Roto Grip line. For me, it was a little bit earlier and covered more boards than the Reality! Typically in the bigger asymmetric balls, you will see the ball burn all its energy in the front part of the lane, and go pretty straight down lane. But not the Gem! This ball retained way more energy than I thought it would, and went through the pins very well even from left of 20. I saw the Gem go down the lane a lot when I was on tour, and now I see why. If you want some additional length and energy, don’t hesitate to add some polish. Both Verity Crawley and Anthony Simonson used their Gems with polish, and they looked even better in my opinion.

YouTube Review
https://www.youtube.com/watch?v=_KqguKB6HZ0&t=105s

Social Media
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Bowler Stats
Trevor Roberts
2016 PBA Southern Regional Rookie Of The Year
Storm Products / Turbo 2n1 Grips / Bowlifi Staff Member
Right Handed
Rev Rate: 400
Speed: 16
PAP: 5 1/2 up 13/16

Roto Grip GEM Ball Review

Hey everyone, I’m back with another ball review, and this time it’s for the GEM and in 15 pounds this ball is wrapped in the Micro Trax Solid Coverstock and comes 2000-grit polish with an RG of 2.470 and a Diff of 0.053 and a PSA .016.
Layout for this ball is 4x4x2
I have enjoyed when I am able to get this ball into my hands, but with bigger balls in my hand and the mid-dry I have at home I don’t get to throw this ball as much as I would like too. I keep this ball in my tournament bag and its really good when the lanes start with a higher volume or longer pattern. I can see this ball being thrown on a fresher condition with players with more hand. I am on the lower rev rate side and need the stronger balls to see the friction so with the right condition I can stay in the track a little longer than most before having to move.
BOWLER STYLE: RH - Power Stroker Rev Rate: 320 Ball Speed: 15-16 PAP: 4 7/8 right 5/8 up.

#Storm #SquadRG #900Global #VISE #BowlersChoiceProShop #BabesAndBallsBowling #LogoInfusion #IAmBowling (coupon code HIRSCH 20% off at checkout)

YouTube Channel: https://www.youtube.com/channel/UCVgKzdcnglpcCjAVFMBiVNg
Brian Hirsch