The Shimano HB-758 XT Front Hub is a performance hub for use with disc or rim brakes. Avialiable for standard quick release, 15mm or 20mm bolt thru axle forks, Shimano HB-758 XT Front Hub Features Available for rim brake, 6-bolt or Centre-Lock disc rotor mount Double contact seals with internal grease sleeve to keep the elements out and the grease in, extending service life and maintain smooth operations even in the toughest terrain 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 Lightweight and strong alloy axle housing for excellent rigidity when used with suspension forks Ultra-smooth bearing races provide a long lasting low-friction rolling action Anodised forged aluminium hub shell