Onyx 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. Uphill or downhill, Onyx ceramic hybrid bearings get you rolling faster and with less effort.XDR Driver includes XD spacerVesper hubs are the lightest MTB hubs from Onyx, intended for cross-country and trail useOnyx s patented sprag clutch design removes the ratcheting noise of traditional hubsItem SpecificationsBearing TypeSealed CartridgeCassette Body TypeSRAM XDCassette Body TypeSRAM XDRCenter to Flange, Left35.65Center to Flange, Right22.47ColorBlackDefined ColorBlackFlange Diameter, Left60Flange Diameter, Right60Hub Drilling32Hub/Brake Compatibility6-Bolt DiscRear Axle12mm Thru x 148mmSpoke InterfaceJ-BendWeight420 ONYX Racing Products Vesper Rear Hub Rear Hub