This freehub body is engineered for directly replacing the freehub body that comes with Nukeproof Horizon Pro hubs. It features a hard-wearing alloy construction, which makes it ideal at handling all the abuse that's associated with fast and intense MTB rides. Perfect for replacing your old or worn-out existing freehub body, it allows for quick and easy installation. Features Material: Alloy Cassette Compatibility: SRAM XD Hub Compatibility : This freehub is only compatible with Nukeproof Horizon Pro hubs. 54t ratchet