Freehub bodies put up with a tremendous amount of abuse. After all, they're the interface between your pedaling motion, and the force applied to your rear wheel. Just think of those grinding up hills. When your cassette is starting to feel a little bit loose, or you find during maintenance tasks that it's difficult to get that cassette back on there, it might be time to replace your freehub. The DT Swiss Steel Mountain HG Freehub Body, Standard Bearing might be the part you need. Specifications: Fits current 180, 240 and 350 hubs Accepts Shimano/SRAM 8,9,10 Speed cassettes and Shimano Dynasys 11-Speed mountain cassettes Compatible with DT star ratchet rear hubs Material: Steel