Specifications Hign-concerned Chemical:None Type:MTB Bike Freewheel is_customized:No Model Number:-SZ Sensitivity:108 Sounds Flywheel Adjustable Gear Number:11-Speed Material:STEEL Gear Teeth:36 - 42T Freewheel Speed:10 Origin:Mainland China Components:Freewheel Bicycle Cassette MTB/Road Freewheel HyperGlide Sprocket 8/9/10/11/12 Speed Cassette Parts 32T/36T/40T/42T/46T/50T/52T *We have the following models: 8Speed : 11T-36T / 11T-40T / 11T-42T / 11T-46T 9Speed : 11T-36T / 11T-40T / 11T-42T / 11T-46T / 11T-50T 10Speed: 11T-36T / 11T-40T / 11T-42T / 11T-46T / 11T-50T 11Speed: 11T-40T / 11T-42T / 11T-46T / 11T-50T / 11T-52T 12Speed: 11T-40T / 11T-42T / 11T-46T / 11T-50T / 11T-52T Special reminder: This bicycle freewheel serves the HG structure and can only be used for the HG bicycle hub body, not for SRAM XD or MS (Micro spline) If you used for SRAM shifting system, it can only be used for HG structure bicycle hub body, not for XD structure bicycle hub body !!! Special reminder: If there is an extended tail hook icon on the SKU picture, it means that the model needs a tail hook extender, if there is no extended tail hook icon, the model does not need a tail hook extender