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Roto Grip Gremlin specs
The Roto Grip Gremlin is a pearl reactive ball with the Rondure MaxD 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 | V-R1 Pearl |
|---|---|
| Cover type | Pearl reactive |
| Core (weight block) | Rondure MaxD |
| Core type | Asymmetric |
| RG | 2.500 |
| Differential | 0.056 |
| Mass bias / intermediate diff. | 0.008 |
| Factory finish | Power Edge |
| Flare potential (maker) | High |
| Maker's category | HP3 |
| Color | Plum/Raisen/Tanzanite |
| Release date (maker) | 07/18/25 |
| USBC approved | 3 June 2025 |
Numbers as Roto Grip publishes them, checked 21 October 2026. Roto Grip doesn't say which ball weight these numbers are for. 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 2.500. That is lower than 43% 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 0.056. Higher than 91% 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 Roto Grip.
Balls with similar numbers
Same cover type, closest RG and differential in our table:
- Storm Identity: RG 2.500, differential 0.055
- Hammer Black Widow Mania: RG 2.500, differential 0.058
- Motiv Apex Jackal: RG 2.520, differential 0.055
- Motiv Raptor Pursuit: RG 2.480, differential 0.055
Sources: Roto Grip 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.