According to an illustrative example of the invention a transmission lever for transmitting an actuating force from a pull cable to a push rod of a bicycle hub gear change mechanism is pivotally mounted on a housing. The housing is provided with a sleeve which sleeve is rotatable and axially fixed with respect to the housing. The sleeve is provided with an internal thread for engagement with an external thread of a hub axle. For assembling the housing with the hub axle the sleeve can be locked against rotation with respect to the housing.
