DT Swiss Steel Mountain Freehub Body Standard Bearing: Fits current 180 240 and 350 hubs Accepts ShimanoRAM 8,9,10 Speed cassettes and Shimano Dynasys 11-Speed mountain cassettes Accepts Shimano/SRAM 8,9,10 Speed cassettes and Shimano Dynasys 11-Speed mountain cassettes Compatible with DT star ratchet rear hubs Replacement 9/10 speed mountain freehub bodies for DT Swiss hubs.