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Storm !Q Tour 78/U specs
The Storm !Q Tour 78/U is a urethane ball with the C3C 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 | Controll 78 Urethane |
|---|---|
| Cover type | Urethane |
| Core (weight block) | C3C |
| Core type | Symmetric |
| RG | 2.650 |
| Differential | 0.035 |
| Factory finish | 500 Grit |
| Flare potential (maker) | Medium-Low |
| Maker's category | Master |
| Color | Crimson |
| Release date (maker) | 12/15/23 |
| USBC approved | 17 October 2023 |
Numbers as Storm publishes them, checked 21 October 2026. Storm 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 2.650. That is lower than 1% 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 0.035. Higher than 18% of the balls in our table. Storm says "a low differential ball tends to have a more predictable, controlled motion."
Urethane cover. Storm says urethane covers "displace oil rather than absorbing it" and are a popular choice for spares and shorter oil patterns.
Symmetric core. Storm says symmetric balls have "RG values consistent across all axes" and a smooth, predictable roll.
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 Storm.
Balls with similar numbers
Same cover type, closest RG and differential in our table:
- Hammer Purple Pearl Urethane 78D: RG 2.632, differential 0.034
- Hammer Black Pearl Urethane: RG 2.650, differential 0.015
- Hammer Purple Pearl Urethane: RG 2.650, differential 0.015
- Storm Pitch Black: RG 2.560, differential 0.023
Sources: Storm product page; Storm, "Inside The Bowling Ball"; Storm, "The Coverstock"; USBC Approved Ball List (20 October 2026); USBC Equipment Specifications Manual.