The new XT FH-M8110-B Rear Hub features easy disc rotor installation using Shimano's Centerlock design, Shimano's new Microspline freehub design which is ready for the company's new 12-speed drivetrains, and 7 degrees of engagement providing faster acceleration which amplifies riding excitement. This hub features 12 x 148mm boost rear spacing and the wide flange profile allows for the potential to build a wheel with zero dish. The XT FH-M8110-B's cup and cone bearing system is durable and long-lasting providing you with a solid performing product for many years.