Abstract: A hub assembly for a bicycle wheel is comprised of two spaced flanges for connection to the spokes of a wheel and a tubular center section. One flange is provided with a circular array of holes for mounting a disk brake rotor. The opposite flange is provided with an internal spline axially aligned and housed within the hub. Said spline slidably engages with a spline on a ring pawl member, which has ramped teeth on a surface facing a tubular sprocket carrier. The teeth on said ring pawl member interact with corresponding teeth on said tubular sprocket carrier to create a unidirectional clutch mechanism. Said tubular sprocket carrier is also provided with external splines to accept industry standard toothed sprockets. The clutch mechanism and bearings are arranged so as to allow a large diameter sleeve axle to fit unrestricted within the confinement of the industry standard drive sprocket's internal splines.