High performance freehub for disc brakes: XT is renowned for offering the best performance to value ratio MICRO SPLINE freehub has be developed to enable the use of a 10T cassette sprocket, to be used in conjunction with Shimano 12-speed cassettes MICRO SPLINE freehub body with quick pawl engagement (10 degrees) provides perfect traction and instant power transfer Designed for use with Centre Lock disc rotors for secure hassle free set-up Double contact sealing with internal grease sleeve helps to keeps out water and dirt from bearings ensuring constant smoothness and longevity whilst keeping the grease in place Borozon treated cone bearing races provide precision low-friction rolling Cup and cone bearings for durability, strength and smooth rotation