A bicycle front shifting system includes operable to transmit a wireless signal, a crank assembly with two crank arms and a pedal on each of the two crank arms. The crank assembly is rotatable about a rotation axis. A front shift unit is coupled to the crank assembly and is rotatable about the rotation axis. The front shift unit includes a chain ring component with a big chain ring and a small chain ring. The small chain ring has a small diameter and the big chain ring has a big diameter that is larger than the small diameter. A shift mechanism is coupled to and rotatable with the chain ring component about the rotation axis. The shift mechanism is configured to receive the wireless signal from the shifter and to shift a chain between the big chain ring and the small chain ring according to the wireless signal.

The invention relates to an actuation device for actuating the front derailleur of a bicycle, comprising a control pin, configured to be set in rotation by a control lever, rotatable about a rotation axis in a first angular direction between the first and last angular positions and in a second angular direction between the last and the first angular positions. A cable-winding bush rotates between the first and last winding positions. An indexer has a plurality of stop areas corresponding to angular positions between the first and the last angular positions. Elastic members makes the control pin form a unit with the cable-winding bush during rotations of the cable-winding bush between and among the various winding positions and to make the control pin rotatable with respect to the cable-winding bush between the last winding position of the cable-winding bush and the last angular position of the control pin.

A bicycle derailleur is provided with a base member, a chain guide, a linkage assembly and a cable fixing structure. The base member is configured to be mounted to a bicycle frame. The chain guide is movable between retracted and extended positions with respect to the base member. The linkage assembly operatively couples the chain guide to the base member. The cable fixing structure is configured to fix an operation cable that moves the linkage assembly in response to an operation of the operation cable. The cable fixing structure is mounted to one of the chain guide and the linkage assembly. The cable fixing structure includes a cable attachment member to which the operation cable is fixed. The cable attachment member is movable with respect to the one of the chain guide and the linkage assembly with the operation cable being fixed to the cable attachment member.

A bicycle derailleur is provided with a base member, a chain guide, a linkage assembly and a cable fixing structure. The base member is configured to be mounted to a bicycle frame. The chain guide is movable between retracted and extended positions with respect to the base member. The linkage assembly operatively couples the chain guide to the base member. The cable fixing structure is configured to fix an operation cable that moves the linkage assembly in response to an operation of the operation cable. The cable fixing structure is mounted to one of the chain guide and the linkage assembly. The cable fixing structure includes a cable attachment member to which the operation cable is fixed. The cable attachment member is movable with respect to the one of the chain guide and the linkage assembly with the operation cable being fixed to the cable attachment member.

The invention relates to an actuation device for actuating the front derailleur of a bicycle, comprising a control pin, configured to be set in rotation by a control lever, rotatable about a rotation axis in a first angular direction between the first and last angular positions and in a second angular direction between the last and the first angular positions. A cable-winding bush rotates between the first and last winding positions. An indexer has a plurality of stop areas corresponding to angular positions between the first and the last angular positions. Elastic members makes the control pin form a unit with the cable-winding bush during rotations of the cable-winding bush between and among the various winding positions and to make the control pin rotatable with respect to the cable-winding bush between the last winding position of the cable-winding bush and the last angular position of the control pin.

A bicycle front shifting system includes operable to transmit a wireless signal, a crank assembly with two crank arms and a pedal on each of the two crank arms. The crank assembly is rotatable about a rotation axis. A front shift unit is coupled to the crank assembly and is rotatable about the rotation axis. The front shift unit includes a chain ring component with a big chain ring and a small chain ring. The small chain ring has a small diameter and the big chain ring has a big diameter that is larger than the small diameter. A shift mechanism is coupled to and rotatable with the chain ring component about the rotation axis. The shift mechanism is configured to receive the wireless signal from the shifter and to shift a chain between the big chain ring and the small chain ring according to the wireless signal.

A bicycle front shifting system includes operable to transmit a wireless signal, a crank assembly with two crank arms and a pedal on each of the two crank arms. The crank assembly is rotatable about a rotation axis. A front shift unit is coupled to the crank assembly and is rotatable about the rotation axis. The front shift unit includes a chain ring component with a big chain ring and a small chain ring. The small chain ring has a small diameter and the big chain ring has a big diameter that is larger than the small diameter. A shift mechanism is coupled to and rotatable with the chain ring component about the rotation axis. The shift mechanism is configured to receive the wireless signal from the shifter and to shift a chain between the big chain ring and the small chain ring according to the wireless signal.

A bicycle front shifting system includes operable to transmit a wireless signal, a crank assembly with two crank arms and a pedal on each of the two crank arms. The crank assembly is rotatable about a rotation axis. A front shift unit is coupled to the crank assembly and is rotatable about the rotation axis. The front shift unit includes a chain ring component with a big chain ring and a small chain ring. The small chain ring has a small diameter and the big chain ring has a big diameter that is larger than the small diameter. A shift mechanism is coupled to and rotatable with the chain ring component about the rotation axis. The shift mechanism is configured to receive the wireless signal from the shifter and to shift a chain between the big chain ring and the small chain ring according to the wireless signal.

A bicycle front shifting system includes operable to transmit a wireless signal, a crank assembly with two crank arms and a pedal on each of the two crank arms. The crank assembly is rotatable about a rotation axis. A front shift unit is coupled to the crank assembly and is rotatable about the rotation axis. The front shift unit includes a chain ring component with a big chain ring and a small chain ring. The small chain ring has a small diameter and the big chain ring has a big diameter that is larger than the small diameter. A shift mechanism is coupled to and rotatable with the chain ring component about the rotation axis. The shift mechanism is configured to receive the wireless signal from the shifter and to shift a chain between the big chain ring and the small chain ring according to the wireless signal.