A bicycle gearshift mechanism has a base element, a pivot mechanism, a movable element, and a chain guide arrangement. The pivot mechanism connects the base element to the movable element. The chain guide arrangement is connected, rotatably about a rotary axle, to the movable element. The base element comprises a first attachment end, which is coaxial with respect to the rear-wheel axle or axis, and a second attachment end for coupling to the pivot mechanism.

A bicycle gearshift mechanism has a base element, a pivot mechanism, a movable element, and a chain guide arrangement. The pivot mechanism connects the base element to the movable element. The chain guide arrangement is connected, rotatably about a rotary axle, to the movable element. The base element comprises a first attachment end, which is coaxial with respect to the rear-wheel axle or axis, and a second attachment end for coupling to the pivot mechanism.

A bicycle gearshift mechanism has a base element, a pivot mechanism, a movable element, and a chain guide arrangement. The pivot mechanism connects the base element to the movable element. The chain guide arrangement is connected, rotatably about a rotary axle, to the movable element. The base element comprises a first attachment end, which is coaxial with respect to the rear-wheel axle or axis, and a second attachment end for coupling to the pivot mechanism

A bicycle gearshift mechanism has a base element, a pivot mechanism, a movable element, and a chain guide arrangement. The pivot mechanism connects the base element to the movable element. The chain guide arrangement is connected, rotatably about a rotary axle, to the movable element. The base element comprises a first attachment end, which is coaxial with respect to the rear-wheel axle or axis, and a second attachment end for coupling to the pivot mechanism

A cable clamping mechanism for a bicycle comprises a linkage member, a fixing screw, a nut and a linkage cable. The linkage member includes a first surface and a second surface. A through hole on the linkage member passes through the first surface and the second surface. The fixing screw is provided in the through hole and includes a cable hole passing through a radial direction of the fixing screw, where in the cable hole is on a side of the second surface. The nut joints a bottom end of the fixing screw. The linkage cable passes through the cable hole. The nut presses against the linkage cable so as to clamp the linkage cable in the cable hole. the fixing screw is rotatable within the through hole relative to the linkage member so that the linkage cable can also simultaneously rotate relative to the linkage member.

A cable clamping mechanism for a bicycle comprises a linkage member, a fixing screw, a nut and a linkage cable. The linkage member includes a first surface and a second surface. A through hole on the linkage member passes through the first surface and the second surface. The fixing screw is provided in the through hole and includes a cable hole passing through a radial direction of the fixing screw, where in the cable hole is on a side of the second surface. The nut joints a bottom end of the fixing screw. The linkage cable passes through the cable hole. The nut presses against the linkage cable so as to clamp the linkage cable in the cable hole. the fixing screw is rotatable within the through hole relative to the linkage member so that the linkage cable can also simultaneously rotate relative to the linkage member.

A bracket apparatus for mounting a derailleur to a frame of a human-powered vehicle comprises a bracket body and one of a restriction member and a restriction opening. The bracket body includes a frame attachment portion configured to be attached to the frame of the human-powered vehicle and a derailleur attachment portion to which the derailleur is to be attached. The restriction member is configured to be at least partly provided in the restriction opening to restrict a rotation of the bracket body relative to the frame of the human-powered vehicle in a bracket mounting state where the bracket apparatus is mounted to the frame of the human-powered vehicle.

A bracket apparatus for mounting a derailleur to a frame of a human-powered vehicle comprises a bracket body and one of a restriction member and a restriction opening. The bracket body includes a frame attachment portion configured to be attached to the frame of the human-powered vehicle and a derailleur attachment portion to which the derailleur is to be attached. The restriction member is configured to be at least partly provided in the restriction opening to restrict a rotation of the bracket body relative to the frame of the human-powered vehicle in a bracket mounting state where the bracket apparatus is mounted to the frame of the human-powered vehicle.

A rear derailleur is provided for mounting to a bicycle. An upper body operationally engages the rear derailleur to the bicycle, and a lower body operationally engages a chain cage engaging a chain of the bicycle. Upper and lower link arms are pivotally connected to the upper and lower bodies. The upper link arm includes an actuating arm extending downwardly from the upper link arm through an aperture of the lower link arm. A cable for actuating the derailleur operationally engages the actuating arm for moving the chain cage relative to the bicycle.

A cable clamping mechanism for a bicycle comprises a linkage member, a fixing screw, a nut and a linkage cable. The linkage member includes a first surface and a second surface. A through hole on the linkage member passes through the first surface and the second surface. The fixing screw is provided in the through hole and includes a cable hole passing through a radial direction of the fixing screw, where in the cable hole is on a side of the second surface. The nut joints a bottom end of the fixing screw. The linkage cable passes through the cable hole. The nut presses against the linkage cable so as to clamp the linkage cable in the cable hole. the fixing screw is rotatable within the through hole relative to the linkage member so that the linkage cable can also simultaneously rotate relative to the linkage member.