Smooth Performing Durability Race Face has designed this hub for rolling smoothness, performance & longevity while being easy to service when the time comes. Featuring podium proven, large 6902 cartridge bearings, which have larger ball bearings than bearings used by other manufacturers in their MTB hubs. This hub delivers superb lateral & torsional stiffness & an exceptionally smooth riding experience. Instant Power-Transfer Featuring a unique to Race Face 60-Tooth drive ring, which is engaged by six double toothed pawls to provide 3-degrees of engagement for instant power-transfer. The large bearings compliment this drivetrain efficiency as they are spaced far apart, which increases hub stiffness & stability while evenly dispersing the load. The hub internals are protected by low-drag labyrinth seals, combined with easy swap end caps, all of which are completely tool-free to work on. This hub is a fantastic performer, rolls exceptionally fast & is easy to hassle-free to maintain.