Abstract: A back pedal brake hub having a clutch that is axially shiftable for selective engagement with a brake assembly to effect braking when the clutch is shifted in one direction or with a shell to transmit forward drive motion when the clutch is shifted in another direction with no axial loading of the ball races supporting the shell regardless of the direction in which the clutch is shifted. The engagement between the clutch and the shell is accomplished by means of mating teeth or dogs integrally connected with each of the clutch and the shell so as to provide positive form-locking engagement.

Abstract: A pawl member is formed as an integral structure from a synthetic plastics material, the said member having a pawl tooth extending outwardly from a body part and including a tail for co-operation with an abutment to load the tooth into or out of engagement with a co-operating ratchet formation the member being so designed having regard to its intended context as to operate within the strain limit of the material concerned during normal usage.

Abstract: A gear hub for a bicycle has two co-operating epicyclic gear trains selectively connectable together to a drive input means and to the gear hub under the control of an axially fixed, manually actuable rotatable cam operating on various pawls through axially shiftable cam followers to give a requisite drive transmission path through the gear trains appropriate to the gear ratio selected.