Do the 12 and 13 lb Roto Grip Gremlin use the same core as the 14 to 16 lb?
Roto Grip Gremlin Bowling Ball
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Open Oct 08, 2026 - 04:58 PM
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Staff Answer
Oct 08, 2026 - 04:58 PM
No. Roto lists different numbers for the lighter weights: the 15 lb Roto Grip Gremlin is 2.500 RG and .058 differential, while the 13 lb is 2.570 RG and .032 differential and the 12 lb is 2.590 RG and .029 differential. Those are the numbers of a different core shape, and the lower differential means less track flare, so the 12 and 13 lb roll smoother and hook less than the 14 to 16 lb. The full table is on the product page.
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Roto Grip Gremlin Bowling Ball
What should I know about the Gremlin? Maxed-out asymmetric Rondure core for length and a strong, continuous backend Nano-free V-R1 Pearl Reactive cover, polished at Power Edge Built for medium to medium-heavy oil with length and recovery
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