This is the Shimano Deore XT M758 Disc Brake 6 Bolt Front Hub. Performance 15 mm front hub for use with Disc brake, using 6-bolt mounting system. Designed for 15 mm bolt thru axle forks with 100 mm O.L.D. 6-bolt 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 and 15 mm thru-axles. Ultra-smooth bearing races provide a long lasting low-friction rolling action. Anodised forged aluminium hub shell.