Specifications Hign-concerned Chemical:None Type:MTB Bike Freewheel is_customized:No Model Number:M7100 Sensitivity:60 Sounds Flywheel Adjustable Gear Number:12 Material:Alloy Gear Teeth:10-51T Freewheel Speed:12 Origin:Jp(origin) Components:Freewheel Cassette Sprocket 12-speed CS-M7100-12 SLX - 12-Speed - HYPERGLIDE+ - MTB Cassette Sprocket With its BEAM SPIDER construction, the SLX M7100 12-speed cassette shaves weight while increasing SHIMANO's MTB gearing range another gear. Using SHIMANO's new MICRO SPLINE freehub body and HYPERGLIDE+ tooth profile, these 10-45 and 10-51T cassettes deliver advanced shifting performance. Advanced shifting performance provides the confidence to enjoy any trail Pedal continuously while shifting HYPERGLIDE+ Lighter and stiffer cassette sprocket construction reduces inertia and increases acceleration BEAM SPIDER Lighter drivetrain set up 10T lowest sprocket realized by new FREEHUB body construction MICRO SPLINE Wide range and close step 12-speed drivetrain