Compare bowling balls
Core numbers are compared in one weight. Some brands only publish them for one weight.
Roto Grip RST Hyperdrive Pearl
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Brunswick Strategy
|
Roto Grip Transform Pearl
|
Hammer Black Widow Mania
|
|
|---|---|---|---|---|
| Brand | Roto Grip | Brunswick | Roto Grip | Hammer |
| Line | HP4 | Pro | HP5 | Upper Mid |
| Coverstock | U-R1 Pearl | HK22C² - EVO Pearl | Microtrax Pearl | HK22 - Cohesion Pearl |
| Cover type | Pearl reactive | Pearl reactive | Pearl reactive | Pearl reactive |
| Core | RST AI | Dual Centric | Morph Wing | Gas Mask |
| Core type | Asymmetric | Asymmetric | Asymmetric | Asymmetric |
| RG | 2.510 (16 lb) | 2.509 | 2.500 (16 lb) | 2.500 |
| Diff | 0.051 (16 lb) | 0.047 | 0.050 (16 lb) | 0.058 |
| Int. diff | 0.016 | 0.016 | 0.015 | 0.016 |
| Factory finish | Power Edge | 500, 1000, 1500 Siaair / Crown Factory Compound | Power Edge | 500, 1000, 1500 Siaair / Factory Compound |
| Lane condition | — | — | — | Medium oil – Heavy oil |
| Flare potential | High | — | High | — |
| Reaction | — | — | — | Length with aggressive backend |
| Color | Space Blue / Deep Purple | Black / Blue / Silver | Red / Cherry / Shadow | Cobalt / Black |
| Release date | September 19, 2025 | April 16, 2026 | July 10, 2026 | January 16, 2025 |
| Status | Current | Current | Current | Current |
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