SPEDAO 12s 10-50T 12 speed MTB Bicycle Cassette STEEL CNC Bike Freeewheel fits XD Super Light CNC MadeSPEDAO 12s cassetteModel : WSD-8012-1050-A110-50T Features:Number of Teeth: 10-5012 speed: 10-12-14-16-18-21-24-28-32-36-42-50TChain Compatibility: 12 SpeedWeight: approx. approximately 394.5g12 speed compatible with XD freehubsColors Silver golden Black RainbowMain featuresExclusive patent integrated ring gearSpecial material characteristics combining steel and aluminum alloyThe ring gear is made of a piece of alloy forged steel.Its hardness :HV540-60The nut and support material are aviation aluminum alloyThe structure is the basic structure of SPEDAO companyhardness is HV175-180Intensity is 580-630MPA10-12% elongationMain AdvantagesCompatible : XD CASSETTE GX X01 XX1LIGHT WEIGHT : SPEDAO CASSETTE IS LIGHTER 30-50% THAN Variable speed is quiet and smoothCheaper :the sraod cassette price is only 25-40 of High cost performanceAesthetics:Beautiful and dynamic appearance.There is no hub biting phenomenon.Better mud drainage.Better abrasion resistance