Do the 12 and 13 lb Roto Grip Rockstar Amped use the same core as the 14 to 16 lb?
Roto Grip Rockstar Amped Bowling Ball
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Open Oct 08, 2026 - 04:56 PM
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Staff Answer
Oct 08, 2026 - 04:56 PM
No. Roto lists different numbers for the lighter weights: the 15 lb Roto Grip Rockstar Amped is 2.480 RG and .050 differential, while the 13 lb is 2.580 RG and .047 differential and the 12 lb is 2.640 RG and .037 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 Rockstar Amped Bowling Ball
What should I know about the Rockstar Amped? Symmetric Rocker AI Core with higher RG for length and direction change NanoStar Pearl Reactive cover at a Power Edge polished finish Aggressive, angular backend for medium to medium-heavy oil
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