Compare bowling balls
Core numbers are compared in one weight. Some brands only publish them for one weight.
Brunswick Quantum Bias
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Hammer Spawn
|
Hammer Zero Mercy Solid
|
Roto Grip Transformer
|
|
|---|---|---|---|---|
| Brand | Brunswick | Hammer | Hammer | Roto Grip |
| Line | Pro | High | High | HP5 |
| Coverstock | ECA-XR | HK22C² Solid | HK22C² Solid | VR1 Solid |
| Cover type | Solid reactive | Solid reactive | Solid reactive | Solid reactive |
| Core | Quantum Mushroom High RG Asymmetric | Gauntlet | Super Offset | Morph Wing |
| Core type | Asymmetric | Asymmetric | Asymmetric | Asymmetric |
| RG | 2.563 | 2.501 | 2.524 | 2.500 (16 lb) |
| Diff | 0.052 | 0.050 | 0.053 | 0.050 (16 lb) |
| Int. diff | 0.013 | 0.012 | 0.020 | 0.015 |
| Factory finish | 500 and 1,000 Siaair Micro Pad | 500, 1000 Siaair Micro Pad | 500, 1500 Siaair Micro Pad | 4000 Grit |
| Lane condition | — | Medium oil – Heavy oil | Heavy oil | — |
| Flare potential | — | — | — | High |
| Reaction | — | Strong overall hook | Xtreme hook | — |
| Color | White Solid | Black | Black / Purple / White / Red | Indigo / Violet / Slate |
| Release date | — | May 14, 2026 | November 20, 2025 | January 23, 2026 |
| Status | Retired | Current | Current | Current |
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