Do the 12 and 13 lb Motiv Sigma Tour Pearl use the same core as the 14 to 16 lb?
Motiv Sigma Tour Pearl Bowling Ball
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Open Oct 08, 2026 - 04:48 PM
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Staff Answer
Oct 08, 2026 - 04:48 PM
No. Motiv lists different numbers for the lighter weights: the 15 lb Motiv Sigma Tour Pearl is 2.470 RG and .047 differential, while the 13 lb is 2.570 RG and .032 differential and the 12 lb is 2.630 RG and .024 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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Motiv Sigma Tour Pearl Bowling Ball
What should I know about the Sigma Tour Pearl? Symmetric Sigma Core for a readable, repeatable benchmark motion Atomic Propulsion Pearl Reactive cover at a 5000-grit finish A tour-caliber mid-arsenal benchmark for medium to medium-heavy oil
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