Abstract: A tubular crank arm to be connected between the pedal and the hub bearing assembly of a bicycle. The inner end of the crank arm includes a spline connection and the outer end of the crank arm includes a threaded connection. The threaded connection is mounted within a plug. This plug has an irregularly shaped exterior surface. This plug is to be welded to the housing with the exterior surface of the plug also establishing a mechanical interlocking connection with the tubular housing over and above that of the welding securement of the plug to the housing.