How strong does the Roto Grip Perfect Gem hook and how much flare does it have?
Roto Grip Perfect Gem Bowling Ball
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Open Oct 08, 2026 - 03:23 PM
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Staff Answer
Oct 08, 2026 - 03:23 PM
It hooks hard: it is the heavy oil HP4 asymmetric at the top of the Roto Grip bag. At 15 pounds the GEM + A.I. Core has a low 2.49 RG and a massive .057 differential, and the listed flare potential is 4 to 5 inches. That gives an early, strong read and heavy flare, with continuous drive through the pins instead of rolling out.
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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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