Compare bowling balls
Core numbers are compared in one weight. Some brands only publish them for one weight.
Hammer Extreme Envy
|
Storm Alpha Crux
|
Storm Equinox Solid
|
Roto Grip Perfect Gem
|
|
|---|---|---|---|---|
| Brand | Hammer | Storm | Storm | Roto Grip |
| Line | High | Premier | Premier | HP4 |
| Coverstock | Envy CFI Solid | GI26 Solid | A2S Solid | ER1 Solid |
| Cover type | Solid reactive | Solid reactive | Solid reactive | Solid reactive |
| Core | Launcher LRG | Catalyst AI | Solarion AI | Gem AI |
| Core type | Asymmetric | Asymmetric | Asymmetric | Asymmetric |
| RG | 2.479 | 2.480 (16 lb) | 2.470 (16 lb) | 2.490 (16 lb) |
| Diff | 0.054 | 0.052 (16 lb) | 0.054 (16 lb) | 0.055 (16 lb) |
| Int. diff | 0.022 | 0.017 | 0.016 | 0.017 |
| Factory finish | 500, 2000 Siaair Micro Pad | 2000 Grit | 2000 Grit | 2000 Grit |
| Lane condition | Medium oil – Heavy oil | — | — | — |
| Flare potential | — | High | High | High |
| Reaction | Strong overall hook | — | — | — |
| Color | Black / Crimson / White | Black / Turquoise / Violet | Dark Green / Black / White | Pink / Rose / Onyx |
| Release date | September 21, 2023 | May 29, 2026 | October 17, 2025 | October 2, 2026 |
| Status | Retired | Current | Current | Current |
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