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Track Theorem Delta specs
The Track Theorem Delta is a hybrid reactive ball with the MC2 Asym core. Here are its published specs, how they compare with the other current balls in our table, and what the numbers mean on the lane.
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| Coverstock | Super Response Hybrid (HK22) |
|---|---|
| Cover type | Hybrid reactive |
| Core (weight block) | MC2 Asym |
| Core type | Asymmetric |
| RG | 2.473 |
| Differential | 0.046 |
| Mass bias / intermediate diff. | 0.017 |
| Factory finish | 500, 1000, 1500 Siaair / Factory Compound |
| Maker's category | Upper Mid |
| Color | Black / Indigo / Blue |
| Weights | 16-12 Pounds |
| Release date (maker) | August 13, 2026 |
Numbers as Track publishes them, checked 21 October 2026. Published for a 15-pound ball. Drilling changes how a ball behaves, so a pro shop's layout matters as much as these numbers.
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What the numbers mean
RG 2.473. That is lower than 82% of the 134 current reactive and urethane balls in our table, so it sits on the low side. Storm says "a low RG ball will rev up quickly and roll smoothly."
Differential 0.046. Higher than 46% of the balls in our table. Storm says "a low differential ball tends to have a more predictable, controlled motion."
Hybrid reactive cover. Hybrids mix solid and pearl; Storm says they suit bowlers who need a ball "that can adapt to a variety of lane conditions."
Asymmetric core. Storm says asymmetric balls have "varying RG values along different axes" and more angular motion.
USBC allows an RG from 2.447 to 2.813 inches and a differential of at most 0.060 inches (Equipment Specifications Manual, March 2026). Our ball spec table lists every current ball we track, and who makes bowling balls covers which company owns Track.
Balls with similar numbers
Same cover type, closest RG and differential in our table:
- Ebonite Game Breaker 5 Hybrid: RG 2.480, differential 0.048
- 900 Global Cove: RG 2.480, differential 0.043
- Hammer Full Effect: RG 2.470, differential 0.050
- Storm Bionic: RG 2.470, differential 0.050
Sources: Track product page; Storm, "Inside The Bowling Ball"; Storm, "The Coverstock"; bowling.com coverstock FAQ; USBC Equipment Specifications Manual.