The Stranger Crux V2 Freecoaster Hub is a really burly rear hub, built tough & runs smooth. It boasts a scaled down 6061 aluminium shell paired with a 17mm chromoly bolt-in axle, its design uses 14mm male bolts with a 17mm axle so the bolt sits in the dropout as opposed to the axle (typically 10mm bolts on a 14mm axle). The Crux V2 features a 1-piece 9t driver, tough 14mm bolts, proprietary locknuts & Primo Freemix DSG & NDSG hub guards included. section Product Specs HUB TYPE: Freecoaster AXLE: Male Bolts DRIVER: 9t DRIVE SIDE: Right Side Drive SPOKE HOLES: 36h WEIGHT: 646g (1.42lbs)