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- Axle system end caps or conversion kits for Industry Nine hubs
- For non-boost Hydra 6-bolt front 15x100mm to 20x110mm non-Boost end caps, use XN6155
- (IS) International Standard 6-bolt
- (CL) Center Lock
| Model | Hydra |
| Description | XD/HG 12mm Drive-Side End Cap |