Compare bowling balls
Core numbers are compared in one weight. Some brands only publish them for one weight.
Brunswick Kingpin Rule
|
Track Synthesis
|
Ebonite Spartan
|
Roto Grip Perfect Gem
|
|
|---|---|---|---|---|
| Brand | Brunswick | Track | Ebonite | Roto Grip |
| Line | Pro | High | Pro | HP4 |
| Coverstock | ECA-XR | QR-12 Solid (HK22C) | HK22C² - Optimize Solid | ER1 Solid |
| Cover type | Solid reactive | Solid reactive | Solid reactive | Solid reactive |
| Core | Kingpin Ultra Low RG | I-Core Gen4 | Iron Fist V2 | Gem AI |
| Core type | Asymmetric | Asymmetric | Asymmetric | Asymmetric |
| RG | 2.483 | 2.480 | 2.473 | 2.490 (16 lb) |
| Diff | 0.055 | 0.053 | 0.053 | 0.055 (16 lb) |
| Int. diff | 0.020 | 0.020 | 0.019 | 0.017 |
| Factory finish | 500 and 2,000 Siaair Micro Pad | 500, 1500 Siaair Micro Pad | 500, 1500 Siaair Micro Pad | 2000 Grit |
| Lane condition | — | Heavy oil | Heavy oil | — |
| Flare potential | — | — | — | High |
| Reaction | — | Strong mid-lane and backend | Strong overall hook | — |
| Color | Maroon / Orange / White | Royal Blue / Grey / Purple | Purple / Blue / Dark Blue | Pink / Rose / Onyx |
| Release date | — | February 19, 2026 | January 15, 2026 | October 2, 2026 |
| Status | Retired | Current | Current | Current |
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