This Bubba model by Sun Ringle comes equipped with its in-house Clock'd technology which uses two individual ratchet rings to configure two separate levels of pawl contact & engagement. This means that you can set the hub with three pawls engaging every four degrees for your rampant all mountain runs or with six pawls engaging at eight-degree intervals as you dive into daring downhill rides. Boost-sized for added stiffness & composure on rowdier runs, this aluminium-built hub also comes equipped with four sealed cartridge bearings to ensure a smooth spin as you roll across the roughest surfaces. Available with the choice of Shimano or SRAM XD freehubs, this powerful rear hub is built to push you to greatness.