An electrical actuator for a bicycle rear derailleur making use of a standard wireless remote control (RC) servo unit relying exclusively on highly efficient spur gearing reduction and facilitating highly accurate derailleur positioning thereof through an integral digital magnetic rotary encoder with assembly thereof sealed in a two-piece housing with a lateral extension for an auxiliary spur gear serving to transmit actuation effort thereof to actuation shaft of a rear derailleur.

An electrical actuator for a bicycle rear derailleur making use of a standard wireless remote control (RC) servo unit relying exclusively on highly efficient spur gearing reduction and facilitating highly accurate derailleur positioning thereof through an integral digital magnetic rotary encoder with assembly thereof sealed in a two-piece housing with a lateral extension for an auxiliary spur gear serving to transmit actuation effort thereof to actuation shaft of a rear derailleur.

An electrical actuator for a bicycle rear derailleur making use of a standard wireless remote control (RC) servo unit relying exclusively on highly efficient spur gearing reduction and facilitating highly accurate derailleur positioning thereof through an integral digital magnetic rotary encoder with assembly thereof sealed in a two-piece housing with a lateral extension for an auxiliary spur gear serving to transmit actuation effort thereof to actuation shaft of a rear derailleur.

An electrical actuator for a bicycle rear derailleur making use of a standard wireless remote control (RC) servo unit relying exclusively on highly efficient spur gearing reduction and facilitating highly accurate derailleur positioning thereof through an integral digital magnetic rotary encoder with assembly thereof sealed in a two-piece housing with a lateral extension for an auxiliary spur gear serving to transmit actuation effort thereof to actuation shaft of a rear derailleur.

An electrical actuator for a bicycle rear derailleur making use of a standard wireless remote control (RC) servo unit relying exclusively on highly efficient spur gearing reduction and facilitating highly accurate derailleur positioning thereof through an integral digital magnetic rotary encoder with assembly thereof sealed in a two-piece housing with a lateral extension for an auxiliary anti-backlash spur gear serving to transmit actuation effort thereof to actuation shaft of a rear derailleur.

An electrical actuator for a bicycle rear derailleur making use of a standard wireless remote control (RC) servo unit relying exclusively on highly efficient spur gearing reduction and facilitating highly accurate derailleur positioning thereof through an integral digital magnetic rotary encoder with assembly thereof sealed in a two-piece housing with a lateral extension for an auxiliary anti-backlash spur gear serving to transmit actuation effort thereof to actuation shaft of a rear derailleur.

A user interface of a bicycle derailleur is configured to receive a user input to execute at least one of: calibration in which a sensor is reset; changing an assist operation of an assist driving unit; changing information displayed in a display; a recovering operation by an actuator of the bicycle derailleur; a reset of a pairing operation; changing a shifting threshold used in an automatic shifting mode; changing a communication channel between a wired communication channel and a wireless communication channel; changing a function assigned to an operating device; a shut-down of a system of the bicycle derailleur; a wake-up operation of the system; a restart of the system; an operation of at least one additional bicycle component; changing a shifting mode between the automatic shifting mode and a manual shifting mode; and changing the shifting operation between a synchronized shifting mode and a non-synchronized shifting mode.

A compactable bicycle comprising a frame including a first and second frame portions wherein the frame is unfoldable to a use position for riding by the rider and is foldable to a storage position for storage. The bicycle includes: a rear brake, a rear brake lever, a rear break cable passes through a first cable guide, and a brake cable biasing member that is positioned to urge the rear brake cable back through the first cable guide to be between the first cable guide and the rear brake lever; front and rear wheel connectors to hold the front and rear wheels together; a crank, a front sprocket, a rear cassette, rear sprockets, a chain, and a derailleur; a chain guide that is positioned to engage the chain and to limit a lateral angle of the chain relative to the rear sprocket; or first and second frame element locking surfaces and apertures, and a plunger movable to a clamping position and to a release position.

A bicycle derailleur comprises a derailleur body, a charging port, a charging-port cover, and a cover connector. The charging port is configured to be detachably connected to a charging cable to charge an electric power source. The charging-port cover is configured to be detachably attached to the charging port. The charging-port cover has a detachment state in which the charging-port cover is detached from the derailleur body to allow connection between the charging port and the charging cable. The cover connector is configured to couple the charging-port cover to the derailleur body in the detachment state.

A bicycle derailleur comprises a circuit board, an electrical user interface, a motor housing, and a motor unit. The electrical user interface includes a user accessing portion configured to receive a user input. The motor housing includes a motor accommodating space. The motor unit is provided in the motor accommodating space and configured to generate rotational force and configured to be electrically connected to the circuit board. A first direction is defined from the circuit board toward the electrical user interface or from the electrical user interface toward the circuit board. The plurality of second directions is defined to be perpendicular to the first direction. The motor unit is at least partly provided between the user accessing portion of the electrical user interface and the circuit board when viewed in at least one of the plurality of second directions.