A bracket apparatus for mounting a derailleur to a frame of a human-powered vehicle comprises a bracket body. The bracket body includes a frame attachment portion configured to be attached to the frame of the human-powered vehicle, a derailleur attachment portion to which the derailleur is to be attached, and a cable groove in which a cable is to be at least partly provided.

A bicycle rear derailleur includes a seat assembly, a movable component, a linkage assembly, and a chain guide. The seat assembly includes a first seat body, a second seat body, and a shaft. The shaft is disposed through the first seat body and the second seat body and configured to be mounted on the bicycle frame, and the second seat body is configured to connect the first seat body with the bicycle frame. The linkage assembly connects the movable component with the first seat body. The chain guide is pivotably disposed on the movable component. The first seat body is movable towards or away from the second seat body along a central line of the shaft.

A bicycle rear derailleur includes a seat assembly, a movable component, a linkage assembly, and a chain guide. The seat assembly includes a first seat body, a second seat body, and a shaft. The shaft is disposed through the first seat body and the second seat body and configured to be mounted on the bicycle frame, and the second seat body is configured to connect the first seat body with the bicycle frame. The linkage assembly connects the movable component with the first seat body. The chain guide is pivotably disposed on the movable component. The first seat body is movable towards or away from the second seat body along a central line of the shaft.

A bicycle rear derailleur includes a seat assembly, a movable component, a linkage assembly, and a chain guide. The seat assembly includes a first seat body, a second seat body, and a shaft. The shaft is disposed through the first seat body and the second seat body and configured to be mounted on the bicycle frame, and the second seat body is configured to connect the first seat body with the bicycle frame. The linkage assembly connects the movable component with the first seat body. The chain guide is pivotably disposed on the movable component. The first seat body is movable towards or away from the second seat body along a central line of the shaft.

A bicycle rear derailleur includes a seat assembly, a movable component, a linkage assembly, and a chain guide. The seat assembly includes a first seat body, a second seat body, and a shaft. The shaft is disposed through the first seat body and the second seat body and configured to be mounted on the bicycle frame, and the second seat body is configured to connect the first seat body with the bicycle frame. The linkage assembly connects the movable component with the first seat body. The chain guide is pivotably disposed on the movable component. The first seat body is movable towards or away from the second seat body along a central line of the shaft.

A bracket device is configured to mount a bicycle rear derailleur on a rear-wheel axis of a bicycle. The bracket device includes a frame attachment end for coupling to a bicycle frame and a derailleur attachment end for coupling to the bicycle rear derailleur. The frame attachment end has a first arm and a second arm, which are spaced apart in an axial direction with respect to the rear-wheel axis. The first arm has a first attachment opening through which the rear-wheel axis coaxially passes in a mounting state of the bracket device. The second arm has a second attachment opening through which the rear-wheel axis coaxially passes in the mounting state of the bracket device. The derailleur attachment end has a third attachment opening configured to receive a derailleur fastener for coupling to the base element of the bicycle rear derailleur.

A bracket device is configured to mount a bicycle rear derailleur on a rear-wheel axis of a bicycle. The bracket device includes a frame attachment end for coupling to a bicycle frame and a derailleur attachment end for coupling to the bicycle rear derailleur. The frame attachment end has a first arm and a second arm, which are spaced apart in an axial direction with respect to the rear-wheel axis. The first arm has a first attachment opening through which the rear-wheel axis coaxially passes in a mounting state of the bracket device. The second arm has a second attachment opening through which the rear-wheel axis coaxially passes in the mounting state of the bracket device. The derailleur attachment end has a third attachment opening configured to receive a derailleur fastener for coupling to the base element of the bicycle rear derailleur.

A bicycle rear derailleur includes a base element including a first attachment end for coaxial installation on a rear-wheel axis and a second attachment end, a movable element movable relative to the base element, a linkage mechanism connecting the movable element to the base element, and a chain guide arrangement rotatably connected to the movable element. The second attachment end is coupled to the linkage mechanism. The first attachment end includes a first arm and a second arm, which are spaced apart in an axial direction with respect to the rear-wheel axis. The base element includes an angular position adjustment structure that adjusts an angular position of the derailleur relative to a bicycle frame by rotating the first arm and the second arm about the rear-wheel axis. The angular position adjustment structure is disposed between the first and second attachment ends in a radial direction of the rear-wheel axis.

A bicycle rear derailleur includes a base element including a first attachment end for coaxial installation on a rear-wheel axis and a second attachment end, a movable element movable relative to the base element, a linkage mechanism connecting the movable element to the base element, and a chain guide arrangement rotatably connected to the movable element. The second attachment end is coupled to the linkage mechanism. The first attachment end includes a first arm and a second arm, which are spaced apart in an axial direction with respect to the rear-wheel axis. The base element includes an angular position adjustment structure that adjusts an angular position of the derailleur relative to a bicycle frame by rotating the first arm and the second arm about the rear-wheel axis. The angular position adjustment structure is disposed between the first and second attachment ends in a radial direction of the rear-wheel axis.

Disclosed is a method for controlling power supplied to an electric drive system of an electric bicycle. The method includes determining a pedal assist power level for the electric drive system, determining a first current to be applied to the electric drive system based on the pedal assist power level, detecting a user selected boost assist at a first input while the first current is being applied to the electric drive system, and determining a second current to be applied to the electric drive system based at least in part on both the user selected boost assist and a boost trigger, the boost trigger being received via a second input.