WH-MT501 MICRO SPLINE 12-speed rear disc wheel brings high performance technology to a affordable price point.The hub uses angular contact bearings designed to cradle the balls giving both radial and lateral support for superior strength and durability in real world riding conditions. They also offer precision bearing adjustment and easy maintenance,Easy to use Centre-Lock Disc Rotor mount for secure hassle free setup,24 round 2.3 mm butted stainless steel spokes,Contact seals with internal grease sleeve to keep the elements out and the grease in,29er wheel, 12-speed, 12x148mm E-thru,24 mm wide clincher tyre compatible rim for use with 2 - 2.4 inch tyres,Colour Black,Wheel Diameter 29 inches,Product Type Rear Wheels.