Compare bowling balls
Core numbers are compared in one weight. Some brands only publish them for one weight.
Hammer Spawn
|
Roto Grip Transformer
|
Roto Grip Wicked Gremlin
|
Brunswick Combat Solid
|
|
|---|---|---|---|---|
| Brand | Hammer | Roto Grip | Roto Grip | Brunswick |
| Line | High | HP5 | HP3 | Pro |
| Coverstock | HK22C² Solid | VR1 Solid | GR1 Solid | HK22C² - Alpha Premier Solid |
| Cover type | Solid reactive | Solid reactive | Solid reactive | Solid reactive |
| Core | Gauntlet | Morph Wing | Rondure MaxD | Rampart |
| Core type | Asymmetric | Asymmetric | Asymmetric | Asymmetric |
| RG | 2.501 | 2.500 (16 lb) | 2.500 (16 lb) | 2.502 |
| Diff | 0.050 | 0.050 (16 lb) | 0.056 (16 lb) | 0.051 |
| Int. diff | 0.012 | 0.015 | 0.011 | 0.019 |
| Factory finish | 500, 1000 Siaair Micro Pad | 4000 Grit | 2000 Grit | 500, 1500 Siaair Micro Pad |
| Lane condition | Medium oil – Heavy oil | — | — | — |
| Flare potential | — | High | High | — |
| Reaction | Strong overall hook | — | — | — |
| Color | Black | Indigo / Violet / Slate | Citrine / Red / Purple | Navy / Blue / Slate / Purple |
| Release date | May 14, 2026 | January 23, 2026 | August 7, 2026 | August 13, 2026 |
| Status | Current | Current | Current | Current |
Own some of these balls?
Keep your arsenal in BowlingMaat: weight, layout, surface and maintenance of every ball in one place. Free, and no games to log.