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 old 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 lat