What weights does the Roto Grip Perfect Gem come in, and do the specs change by weight?
Roto Grip Perfect Gem Bowling Ball
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Open Oct 08, 2026 - 02:18 PM
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Staff Answer
Oct 08, 2026 - 02:18 PM
It is listed in 12, 13, 14, 15 and 16 pounds, and the specs do change. The 16 pound is a 2.49 RG and .055 differential, the 15 pound is 2.49 and .057, and the 14 pound is 2.52 and .056. The 13 and 12 pound balls use a dedicated asymmetric core: 2.57 and .032 at 13 pounds, and 2.59 and .029 at 12 pounds.
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Roto Grip Perfect Gem Bowling Ball
What should I know about the Perfect Gem? • Asymmetric GEM + A.I. Core: low 2.49 RG and a massive .057 differential for heavy flare • All-new nano-free E-R1 Solid Reactive cover at a 2000-Grit Abralon finish • The cleaner, stronger, more continuous evolution of the Gem for medium-heavy to heavy oil
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