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Roto Grip Gem Bowling Ball

Original price $199.95 - Original price $199.95
Original price
$199.95 - $199.95
Current price $199.95
Weight: 12 lbs.

Roto Grip Gem Bowling Ball

Sometimes evolution can spark new life into technology from yesteryear. Such is the case with our latest introduction to the HP4 Line of balls. With recent more in-depth studies of flare migration and core tendencies we circled the wagons back to the Defiant Series of bowling balls which featured a core ahead of its time regarding flare migration in order to create a longer constant motion.

Upon further review and testing, we found that by altering the composite of this core shape, we were able to create the fastest revving, strongest continuing, lowest RG asymmetrical core ever offered from Roto Grip now known as the DEFIANTTM LRG CORE. From there, we wrapped the Defiant LRG Core with our most aggressive coverstock material known as MicroTraxTM Solid Reactive making this the optimum ball choice for anyone and everyone on those heavier oil conditions.


Release Date: 3-11-22
Coverstock: MicroTraxTM Solid Reactive
Core: DefiantTM LRG Core
Color: Citrine / Ruby / Amethyst
Finish: 2000-grit Sanded
Condition: Medium/Heavy Oil - Heavy Oil
Flare Potential: High
Available Weights: 16 – 12 lbs.

WEIGHT   RG       DIFF       PSA
16 lbs.     2.47      .051      0.016
15 lbs.     2.47      .053      0.016
14 lbs.     2.50      .052      0.015
13 lbs.     2.57      .032      0.01
12 lbs.     2.59      .029      0.008