Track
Theorem Delta
The Track Theorem Delta is a hybrid reactive bowling ball with the MC2 Asym core. RG 2.473 and differential 0.046 at 15 lb. For medium oil – heavy oil.
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
- Coverstock
- Super Response Hybrid (HK22)
- Cover type
- Hybrid reactive
- Core
- MC2 Asym
- Core type
- Asymmetric
- Factory finish
- 500, 1000, 1500 Siaair / Factory Compound
- Lane condition
- Medium oil – Heavy oil
- Reaction
- Skid / Flip
- Color
- Black / Indigo / Blue
- Weights
- 16–12 lb
- Part number
- 60-108645-93X
- Release date
- August 13, 2026
- Warranty
- Two years from purchase date
Own the Track Theorem Delta?
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Core numbers
|
Weight
|
RG
|
Diff
|
Int. diff
|
|---|---|---|---|
| 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 |
Core: MC2 Asym
Balls like the Theorem Delta
Current balls from any brand with the closest RG, differential, cover and lane condition: an alternative, or a second ball that reacts alike.
