BSD's Back Street Pro Hub was designed around their custom driver that features a skip free mechanism while still maintaining a compact shell. The shell is built from 6061-T6 aluminium that's paired with a 14mm 4140 heat-treated chromoly axle, finished with bombproof female 14mm bolts, chromoly cones, a massive female axle and hefty 6903 bearings. ###section### Product Specs HUB TYPE: Cassette AXLE: 14mm Male DRIVER: 9t DRIVE SIDE: Left Side Drive SPOKE HOLES: 36h WEIGHT: 484g (1.07lbs) Colour: Black; Size: LHD