X-Hub ROAD SP Rear is a very light and sophisticated product and it is intended for competition or ricreational use. Warranty voids when used on an electric-assisted bicycle (E-bike). X-Hub ROAD SP Rear is compatible with the classic standard quick release, with 130mm axle width. X-Hub ROAD SP Rear presents refinements and a mechanical stiffness/weight ratio at the highest level, the Al7075-T6 body is machined from solid and is lightened by meticolous works with CNC machines. The Al7075-T6 17mm diameter axle has a variable thickness, two high quality sealed bearings with external preload system provide reliability and smoothness. The freewheel mechanism is protected by a lip seal and itis provided by a titanium toothed ring to 56 teeth with four points of engagement.