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Roto Grip Gremlin Tour-X specs
The Roto Grip Gremlin Tour-X is a hybrid reactive ball with the Rondure TourX 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 | VR1 Hybrid |
|---|---|
| Cover type | Hybrid reactive |
| Core (weight block) | Rondure TourX |
| Core type | Asymmetric |
| RG | 2.480 |
| Differential | 0.032 |
| Mass bias / intermediate diff. | 0.010 |
| Factory finish | 4000 Grit |
| Flare potential (maker) | Medium |
| Maker's category | HP3 |
| Color | Smoke/Velvet/Ink |
| Release date (maker) | 03/13/26 |
| USBC approved | 20 January 2026 |
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 2.480. That is lower than 65% 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 0.032. Higher than 11% 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 Roto Grip.
Balls with similar numbers
Same cover type, closest RG and differential in our table:
- Radical Intel Recon Hybrid: RG 2.483, differential 0.032
- Brunswick Warning Alert: RG 2.478, differential 0.037
- DV8 Smooth Criminal: RG 2.471, differential 0.028
- Hammer Black Widow Tour V1: RG 2.500, differential 0.034
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.