Abstract: A twist-grip shifter for bicycles having a twist grip, which twist grip includes an outer grip part and an inner twist part. The twist grip has an area with a small diameter, a transitional area, and an area with a large diameter, and the twist grip can be positively and detachably connected to a twist grip shifter in the axial direction. The twist grip can have an elastic rubber grip part and a non-elastic rotary part, and can have a surface structure with root-like, sharp ribs on the external surface of the grip part. The surface structure on the grip part has the advantage that the fins or peaks extend axially along the surface lines, and fit into the bends underneath the joints of the index finger, to essentially guarantee the optimum transmission of torque from the hand of the rider to the twist grip.

Abstract: An index shifter (1) for a bicycle transmission is placed on a handle bar (3). The index shifter has a housing (2) and a notch element (4) with notches (5), which notch element is connected with a rotatable handgrip and with one of the ends of a control cable (7). The housing has an oblong annular space in which a combination notch spring (20) is placed. This spring supports itself on the housing with two feet (24) and acts in concert with the notch element (4) through a projection (23). The combination notch spring (20), composed of a form spring (21) and a leaf spring (22), permits quiet shifting and supplies sufficiently high pre-tension spring power throughout the service life of the combination notch spring (20).