Shimano XTR M975 Center Lock Disc rear hubs have angular contact bearings and oversize alloy axles for Increased wheel rigidity. Precision bearing adjustment and easy maintenance. Angular contact bearings and oversize alloy axles for Increased wheel rigidity Precision bearing adjustment and easy maintenance Center Lock rotor mount system Hub Drilling 32 spokes HubBrake Compatibility CenterLock Disc Rear Axle Type 10 x 1 Color Gray Cassette Body Type Shimano