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Hammer Zero Mercy Tour specs
The Hammer Zero Mercy Tour is a solid reactive ball with the Obsession Tour 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 | C² Tour Edition |
|---|---|
| Cover type | Solid reactive |
| Core (weight block) | Obsession Tour |
| Core type | Not stated |
| RG | 2.469 |
| Differential | 0.034 |
| Mass bias / intermediate diff. | 0.013 |
| Factory finish | 500, 1000 Siaair Micro Pad |
| Maker's category | High Performance |
| Color | Crimson |
| Weights | 16-12 Pounds |
| Release date (maker) | September 17, 2026 |
| USBC approved | 8 September 2026 |
Numbers as Hammer 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 2.469. That is lower than 96% 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 0.034. Higher than 15% of the balls in our table. Storm says "a low differential ball tends to have a more predictable, controlled motion."
Solid reactive cover. Storm says solid covers are "particularly effective on fresh oil patterns," and bowling.com calls them best on heavier oil.
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 Hammer.
Balls with similar numbers
Same cover type, closest RG and differential in our table:
- Storm Ion Pro Solid: RG 2.470, differential 0.035
- Motiv Venom Shock: RG 2.480, differential 0.034
- Motiv Black Venom: RG 2.470, differential 0.036
- Motiv Lethal Venom: RG 2.470, differential 0.036
Sources: Hammer 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.