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Radical The Spy specs
The Radical The Spy is a polyester (plastic) ball with the Asymmetric (DynamiCore) 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 | Textured Polyester |
|---|---|
| Cover type | Polyester |
| Core (weight block) | Asymmetric (DynamiCore) |
| Core type | Asymmetric |
| RG | 2.513 |
| Differential | 0.053 |
| Mass bias / intermediate diff. | 0.017 |
| Factory finish | 500, 1000 Siaair / Factory Compound / Factory Polish |
| Maker's category | Performance Polyester |
| Color | Red / Black |
| Weights | 16-14 lbs. |
Numbers as Radical 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
Polyester cover. Polyester (plastic) is the cover used for spare balls and house balls: it grips the lane least, so the ball goes nearly straight. See our plastic spare ball review.
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 Radical.
Balls with similar numbers
Same cover type, closest RG and differential in our table:
- Hammer Black Widow: RG 2.480, differential 0.058
- Motiv Aspire: RG 2.750, differential 0.028
- Storm Ice Storm Ocean Blue-White: RG 2.680, differential 0.006
- Storm Ice Storm Teal-Silver-Graphite: RG 2.680, differential 0.006
Sources: Radical product page; Storm, "Inside The Bowling Ball"; Storm, "The Coverstock"; USBC Equipment Specifications Manual.