Onyx Racing Vesper Rear IS Disc HubsOnyx Vesper hubs transfer the precise amount of torque you want to the ground when you need it. Nasty climbs on boulders and rock require just the right amount of instantaneous power but only at your command. There is no substitute for absolute control of your machine. Onyxs patented sprag clutch design eliminates the ratcheting noise of traditional hubs IS 6B disc brake mounts Made in USA Model Vesper Front Rear Rear (HG 8 11sp), Rear (Micro Spline),