Abstract: The disclosure provides a wear warning device including a caliper, two brake pads, an elastic component and a first switch. The caliper has two push parts. The two push parts are respectively disposed at a first wall surface and a second wall surface of the caliper. The brake pads are located between the two push parts. The elastic component includes two arm parts and a connection part located between the arm parts. The arm parts are respectively disposed on the brake pads. The first switch is located between the arm parts. When the brake pads are in a worn-out state and the push parts are moved toward each other to force the brake pads to clamp a brake disk and to force the two arm parts to move toward each other, one of the arm parts activates the first switch to produce a wear warning signal.

Abstract: A wireless communication method adapted to an electrical gear-shifting system of bicycle comprises: establishing a first communication connection to an intermediate device by a master controller; establishing a second communication connection to the intermediate device by a slave controller, sending a control signal to the intermediate device through the first communication connection by the master controller, sending the control signal to the slave controller through the second communication connection by the intermediate device, wherein the slave controller controls a motor driver to perform a gear-shifting operation according to the control signal.

Abstract: The disclosure provides a wear warning device including a caliper, two brake pads, an elastic component and a first switch. The caliper has two push parts. The two push parts are respectively disposed at a first wall surface and a second wall surface of the caliper. The brake pads are located between the two push parts. The elastic component includes two arm parts and a connection part located between the arm parts. The arm parts are respectively disposed on the brake pads. The first switch is located between the arm parts. When the brake pads are in a worn-out state and the push parts are moved toward each other to force the brake pads to clamp a brake disk and to force the two arm parts to move toward each other, one of the arm parts activates the first switch to produce a wear warning signal.

Abstract: An authorization pairing method is applicable to an electronic derailleur system for a bicycle, comprising: an authorization device broadcasting a authorization signal, and the first communication device and the second communication device respectively performing the first scanning process and the second scanning process, and each scanning process determine whether the authorization signal is obtained, the first communication device determines whether an identification code is obtained after obtaining the authorization signal, and the second communication device sends an identification code representing the identity after obtaining the authorization signal, and the first communication device obtains the identification code and establishes an authorization pairing with the second communication device.

Abstract: A wireless communication method adapted to an electrical gear-shifting system of bicycle comprises: establishing a first communication connection to an intermediate device by a master controller; establishing a second communication connection to the intermediate device by a slave controller, sending a control signal to the intermediate device through the first communication connection by the master controller, sending the control signal to the slave controller through the second communication connection by the intermediate device, wherein the slave controller controls a motor driver to perform a gear-shifting operation according to the control signal.

Abstract: An authorization pairing method is applicable to an electronic derailleur system for a bicycle, comprising: an authorization device broadcasting a authorization signal, and the first communication device and the second communication device respectively performing the first scanning process and the second scanning process, and each scanning process determine whether the authorization signal is obtained, the first communication device determines whether an identification code is obtained after obtaining the authorization signal, and the second communication device sends an identification code representing the identity after obtaining the authorization signal, and the first communication device obtains the identification code and establishes an authorization pairing with the second communication device.

Abstract: A control device with adjustable communication period is configured for an electromechanical gear shifter of a bicycle. The control device comprises a master controller and a trigger sensor. The master controller sends a broadcast signal with a first period when the master controller is in a working mode. The master controller sends the broadcast signal with a period selected from an idle period set when the master controller is in an idle mode. The trigger sensor is in communicable connection with a master controller, and the trigger sensor detects a trigger state to send a trigger signal. The master controller switches to the working mode when the master controller receives the trigger signal. The master controller switches to the idle mode selectively when the master controller does not receive the trigger signal.

Abstract: A control device with adjustable communication period is configured for an electromechanical gear shifter of a bicycle. The control device comprises a master controller and a trigger sensor. The master controller sends a broadcast signal with a first period when the master controller is in a working mode. The master controller sends the broadcast signal with a period selected from an idle period set when the master controller is in an idle mode. The trigger sensor is in communicable connection with a master controller, and the trigger sensor detects a trigger state to send a trigger signal. The master controller switches to the working mode when the master controller receives the trigger signal. The master controller switches to the idle mode selectively when the master controller does not receive the trigger signal.