Release Date: 8/13/26
The Benchmark Evolves!
The Track Theorem earned its reputation as one of the best rolling balls in Track history by delivering a motion that simply worked across styles, conditions, and skill levels. Now, the Track Theorem Delta builds on that legacy, recreating the trusted Theorem shape with enhanced performance. Designed to stay true to the original’s benchmark performance, the Theorem Delta offers a powerful blend of strong midlane and a sharper response to friction, giving bowlers the best of both worlds. Compared to the original, it delivers added responsiveness downlane while preserving that sweeping ball motion that made the Theorem so reliable. The result is a versatile, go-to option that captures the essence of the original, now with more continuation and backend that Track fans love.
Specifications
| Performance | Upper Mid |
| Part Number | 60-108645-93X |
| Color | Black / Indigo / Blue |
| Core | MC2 Asym |
| Coverstock | Super Response Hybrid (HK22) |
| Cover Type | Hybrid Reactive |
| Finish | 500, 1000, 1500 Siaair / Factory Compound |
| Weights | 16-12 Pounds |
| Lane Condition | Medium to oily |
| Reaction | Skid / Flip |
| Warranty | Two years from purchase date |
| Release Date | August 13, 2026 |
Core Numbers
Weight | RG | DIFF | ASY |
| 16 lb | 2.485 | 0.044 | 0.017 |
| 15 lb | 2.473 | 0.046 | 0.017 |
| 14 lb | 2.487 | 0.046 | 0.017 |
| 13 lb | 2.597 | 0.041 | 0.014 |
| 12 lb | 2.593 | 0.041 | 0.014 |
HYPER KINETIC 22
HK22 features enhanced color and clarity by engineered nano micellular phase separation technology, dramatically improving the cover’s translucency.
Click HERE to learn more about HyperKinetic22 coverstock.
DYNAMICORE TECHNOLOGY
The Theorem Delta uses DynamiCore – the industry leading innovation in outer core technology developed by Brunswick Bowling Products. This leap in bowling ball technology is a more durable outer material that yields less compression upon impact increasing hitting power and creating an undeniable difference in sound and pin carry.