Abstract: An epicyclic change-speed hub for a bicycle has a driver which overlaps both the planet cage and gear ring in the axial direction of the hub and is connectable with such planet cage and gear ring by respective pawl and ratchet couplings. A spring-loaded coupling sleeve is provided which is movable axially of the hub and such sleeve serves to control, according to its axial position, the operation or otherwise of the coupling between the driver and the planet cage. The coupling sleeve is in two parts, one part being intended to control the coupling between the driver and the planet cage and the other part being co-operable, according to position, with a pawl and ratchet coupling between the gear ring and hub shell to control the operation of such latter coupling. The spring loading is applied to the coupling sleeve parts between the sleeve and a fixed datum and also between the individual parts of the sleeve.