`- Axle system conversion kits for Industry Nine Hydra hubs\n- For non-boost 6-bolt front 15x100mm to 20x110mm non-boost endcaps, USE XN-6155\n- (IS) International Standard 6-bolt\n- (CL) Center Lock
- converts to:
- 15x110mm Boost end caps
- hub model:
- front: Hydra (IS) 15x110 Boost