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Radical Guru Oracle Pearl specs
The Radical Guru Oracle Pearl is a pearl reactive ball with the Guru Asymmetric 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 | HK22C+ Pearl |
|---|---|
| Cover type | Pearl reactive |
| Core (weight block) | Guru Asymmetric |
| Core type | Asymmetric |
| RG | 2.503 |
| Differential | 0.044 |
| Mass bias / intermediate diff. | 0.018 |
| Factory finish | 500, 1000, 1500 Siaair / Factory Compound |
| Maker's category | Top Shelf |
| Color | Black / Gold |
| Weights | 16-12 lbs. |
| Release date (maker) | June 11, 2026 |
| USBC approved | 2 June 2026 |
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
RG 2.503. That is lower than 40% of the 134 current reactive and urethane balls in our table, so it sits on the high side. Storm says "a high RG ball delays its revving, offering more length and angular motion down the lane."
Differential 0.044. Higher than 42% of the balls in our table. Storm says "a low differential ball tends to have a more predictable, controlled motion."
Pearl reactive cover. Pearl covers skid farther before they hook; bowling.com calls them best on medium to dry lanes, and Storm ties them to dry 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 Radical.
Balls with similar numbers
Same cover type, closest RG and differential in our table:
- Motiv Nebula: RG 2.500, differential 0.045
- DV8 Double Trouble: RG 2.496, differential 0.045
- Hammer Bubblegum Vibe: RG 2.510, differential 0.042
- Radical Evil Eye Pearl: RG 2.495, differential 0.046
Sources: Radical product page; Storm, "Inside The Bowling Ball"; Storm, "The Coverstock"; bowling.com coverstock FAQ; USBC Approved Ball List (20 October 2026); USBC Equipment Specifications Manual.