Abstract: A bicycle hub comprises a hollow hub body rotatably supported on a hub shaft, a drive member rotatably supported on the hub shaft at one end of the hub body to receive a driving force, a slider disposed within the hub body for co-rotation with the drive member on the hub shaft but slidable axially of the hub shaft. The hub body are brought into driving engagement with the slider by a first ratchet mechanism in one rotational direction as well as by a second ratchet mechanism in the opposite rotational direction. The slider is axially moved by a change-over mechanism to bring selected one of the first and second ratchet mechanisms out of ratcheting operation.

Abstract: A bicycle deraileur comprising a parallelogrammic linkage mechanism including a base member, a first link pivotally connected at one end thereof to the base member by a first pin, a second link pivotally connected at one end thereof to the base member by a second pin, and a movable member pivotally connected to the other ends of the first and second links by third and fourth pins respectively; a chain guide mechanism carried by the movable member; an operating member pivotally mounted on the firs pin for operation by a cable and provided with a pin; a torsion spring arranged on the first pin to engage with the operating member and the first link, the spring elastically urging the operating member to counteract a tension applied to the cable; and a restraining link pivotally connected at one end to the fourth pin and having a slot extending from the other end toward the fourth pin and slidably receiving the pin of the operating member.