Performance XT hubs for use with disc or rim brakes Available for standard quick release 15 mm or 20 mm bolt thru axle forks Available for rim brake 6-bolt or Centre-Lock disc rotor mount Double contact seals with internal grease sleeve to keep the elements out & the grease in extending service life & maintain smooth operations even in the toughest terrain The hub uses angular contact bearings designed to cradle the balls giving both radial & lateral support for superior strength & durability in real world riding conditions; they also offer precision bearing adjustment & easy maintenance Lightweight & 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