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Ebonite Spartan Pearl specs
The Ebonite Spartan Pearl is a pearl reactive ball with the Iron Fist V2 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 | HK22C² - Optimize Pearl |
|---|---|
| Cover type | Pearl reactive |
| Core (weight block) | Iron Fist V2 |
| Core type | Asymmetric |
| RG | 2.473 |
| Differential | 0.053 |
| Mass bias / intermediate diff. | 0.019 |
| Factory finish | 500, 1000, 1500 Siaair / Factory Compound |
| Maker's category | Pro Performance |
| Color | Sky Blue / Purple / Carbon |
| Weights | 16-12 Pounds |
| Release date (maker) | July 16, 2026 |
| USBC approved | 30 June 2026 |
Numbers as Ebonite 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 0.053. Higher than 74% of the balls in our table. Storm says "a high differential ball will create a sharper angle of entry into the pins."
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 Ebonite.
Balls with similar numbers
Same cover type, closest RG and differential in our table:
- Storm Ion Max Pearl: RG 2.470, differential 0.053
- Track Synthesis Prime: RG 2.480, differential 0.053
- Storm Equinox: RG 2.470, differential 0.054
- Motiv Steel Forge: RG 2.470, differential 0.055
Sources: Ebonite 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.