A hollow bicycle crank arm 10 is fabricated from first and second components 11, 21 that are affixed at a joint 20 that is distal from the crank spindle mounting boss 12. The joint 20 is at least partially transverse to the long axis of the crank arm 10. Each component 11, 21 has a relatively-solid mounting boss 12, 22 for attaching a crank spindle or a pedal. One, or both components have a tubular portion 15 integral with the mounting boss 12, 22. Integration of mounting boss and tubular portions enables economic fabrication of a structurally-optimal design, and eliminates the need for a joint proximate to the mounting boss 12, 22.