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.

Abstract: A bearing assembly and method of installing such within an enclosing open walled chamber wherein the bearing assembly utilizes first and second spaced apart bearing units. The bearing units low frictionally rotationally support a crank. The inner races of the spaced apart bearing units are connected together through a sleeve which is located about the crank. Mounted on the outer race of each bearing assembly is an expanding ring assembly. Each expanding ring assembly can be moved into tight engagement with the wall of the chamber.