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Compare
Compare bowling balls side by side
Pick two or three of the 149 current balls in our spec table to see their numbers next to each other, and what the differences mean.
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Reading a comparison
Compare cover types first: the cover decides how early a ball grips the lane. Storm calls solid covers "particularly effective on fresh oil patterns," pearls suit medium to dry lanes, and hybrids sit between. Then compare the core numbers:
- RG: Storm says "a low RG ball will rev up quickly and roll smoothly," while "a high RG ball delays its revving."
- Differential: "A high differential ball will create a sharper angle of entry into the pins," and a low one gives "a more predictable, controlled motion."
- Mass bias (intermediate differential) is published for asymmetric cores only.
Small gaps on paper can disappear once a ball is drilled, so treat close numbers as close. Every number is the maker's own, checked 21 October 2026; see each ball's page for its source.
Sources: maker product pages (linked from each ball's page); Storm, "Inside The Bowling Ball"; Storm, "The Coverstock"; USBC Approved Ball List (20 October 2026).