Abstract: A bicycle braking and parking device includes a casing, two brake pads, a locking pin, and an electromagnetic driver. The casing has an accommodation space and two pistons located at two opposite sides of the accommodation space. The accommodation space can accommodate part of a brake disk. The brake pads are located at the accommodation space and located between the pistons. The pistons can push the brake pads, and the brake pads can clamp the brake disk. The locking pin is movably disposed on the casing. The electromagnetic driver can force the locking pin to move between a released position and a locked position. when the locking pin is in the released position, the locking pin is separated from the brake disk. When the locking pin is in the locked position, the locking pin is inserted into the brake disk to limit a motion of the brake disk.

Abstract: 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.

Abstract: The disclosure provides a bicycle front derailleur configured to be mounted on a bicycle frame. The bicycle front derailleur includes a fixed component, a chain guide, a linkage assembly, and an adjustment component. The fixed component is configured to be mounted on the bicycle frame. Two opposite ends of the linkage assembly are respectively and pivotably disposed on the fixed component and the chain guide. The adjustment component is pivotably disposed on the fixed component. The adjustment component is configured to press against the bicycle frame so as to adjust a position of the bicycle front derailleur with respect to the bicycle frame.

Abstract: A bicycle braking and locking mechanism is configured to be mounted on a handlebar. The bicycle braking and locking mechanism includes a brake assembly, a first driving component, and a second driving component. The brake assembly includes a main body, a piston, and a link. The main body is configured to be mounted on the handlebar and has a pressure chamber, the piston is movably located in the pressure chamber, and the link is connected to the piston. The link is configured to be selectively driven by the first driving component or the second driving component so as to move the piston with respect to the pressure chamber.

Abstract: A bicycle braking and parking device includes a casing, two brake pads, a locking pin, and an electromagnetic driver. The casing has an accommodation space and two pistons located at two opposite sides of the accommodation space. The accommodation space can accommodate part of a brake disk. The brake pads are located at the accommodation space and located between the pistons. The pistons can push the brake pads, and the brake pads can clamp the brake disk. The locking pin is movably disposed on the casing. The electromagnetic driver can force the locking pin to move between a released position and a locked position. when the locking pin is in the released position, the locking pin is separated from the brake disk. When the locking pin is in the locked position, the locking pin is inserted into the brake disk to limit a motion of the brake disk.

Abstract: A bicycle braking and locking mechanism is configured to be mounted on a handlebar. The bicycle braking and locking mechanism includes a brake assembly, a first driving component, and a second driving component. The brake assembly includes a main body, a piston, and a link. The main body is configured to be mounted on the handlebar and has a pressure chamber, the piston is movably located in the pressure chamber, and the link is connected to the piston. The link is configured to be selectively driven by the first driving component or the second driving component so as to move the piston with respect to the pressure chamber.

Abstract: 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.

Abstract: The disclosure provides a bicycle front derailleur configured to be mounted on a bicycle frame. The bicycle front derailleur includes a fixed component, a chain guide, a linkage assembly, and an adjustment component. The fixed component is configured to be mounted on the bicycle frame. Two opposite ends of the linkage assembly are respectively and pivotably disposed on the fixed component and the chain guide. The adjustment component is pivotably disposed on the fixed component. The adjustment component is configured to press against the bicycle frame so as to adjust a position of the bicycle front derailleur with respect to the bicycle frame.

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: The disclosure provides a bicycle caliper control method. The bicycle caliper control method is configured to control a rear caliper and a front caliper of a bicycle. The bicycle caliper control method includes: when a first brake lever of the bicycle is squeezed, the first brake lever activates the rear caliper and the front caliper; and when a second brake lever of the bicycle is squeezed, the second brake lever activates the rear caliper.

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 bicycle stem includes a handlebar and a dual control lever which includes a brake device and a first electronic sending unit. The first electronic sending unit is detachably fixed to the brake device. The brake device and the first electronic sending unit together form an assembly space for a handlebar installed therein. The handlebar is assembled with the brake device and the first electronic sending unit in the assembly space.

Abstract: A dual control lever includes a fixed base, a brake lever, a pivot lever, a first electrical button, a second electrical button and a third electrical button. The brake lever is pivoted on the fixed base. The pivot lever is rotatably close to the brake lever. The first electrical button is disposed on the pivot lever. The second electrical button disposed on the pivot lever. The third electrical button is disposed on the pivot lever.

Abstract: A clutch assembly includes an axle, a gear seat, at least one one-way bearing, an outer limiting sleeve and a hub. The gear seat is rotatably positioned around the axle. The at least one one-way bearing includes an outer race and an inner race. The inner race is securely fitted around the gear seat. The outer race is rotatably positioned around the inner race. The outer race is rotatable relative to the inner race in only one direction. The outer limiting sleeve is securely fitted around the outer race. The hub is securely fitted around the outer limiting sleeve.

Abstract: A derailleur includes a fixed component, a movable component, a linkage component, a deceleration component and a drive component. The fixed component is for being fixed to a bicycle frame. The movable component is for being fixed to a chain guide. The linkage component includes a first linkage and a second linkage. Two ends of the first linkage pivot on the fixed component and the movable component, respectively. Two ends of the second linkage pivot on the fixed component and the movable component, respectively. The deceleration component includes a circular spline, a flex spline and a wave generator. The flex spline is disposed inside the circular spline, for rotating the first linkage and the second linkage relative to the fixed component. The wave generator is disposed inside the flex spline. The drive component is connected to the wave generator, for rotating the wave generator.

Abstract: A bicycle front fork assembly includes a stem and a front fork. The front fork includes a fork crown, a first fork leg and a second fork leg. The stem is connected to the fork crown. The top end of the first fork leg and the second fork leg are connected to the two ends of the fork crown, respectively. The bottom end of the first fork leg and the second fork leg are connected to two ends of a hub which are opposite to each other, respectively. A disk brake rotor has a center coaxially connected to one end of the hub close to the first fork leg. A disc brake caliper is partially disposed within an accommodating recess formed on a surface of the first fork leg facing the second fork leg and close to the disk brake rotor.

Abstract: A bicycle stem includes a handlebar and a dual control lever which includes a brake device and a first derailleur. The first derailleur is detachably fixed to the brake device. The brake device and the first derailleur together form an assembly space for a handle installed therein. The handlebar is assembled with the brake device and the first derailleur in the assembly space.

Abstract: A clutch assembly includes an axle, a gear seat, at least one one-way bearing, an outer limiting sleeve and a hub. The gear seat is rotatably positioned around the axle. The at least one one-way bearing includes an outer race and an inner race. The inner race is securely fitted around the gear seat. The outer race is rotatably positioned around the inner race. The outer race is rotatable relative to the inner race in only one direction. The outer limiting sleeve is securely fitted around the outer race. The hub is securely fitted around the outer limiting sleeve.

Abstract: A dual control lever includes a fixed base, a brake lever, a pivot lever, a first electrical button, a second electrical button and a third electrical button. The brake lever is pivoted on the fixed base. The pivot lever is rotatably close to the brake lever. The first electrical button is disposed on the pivot lever. The second electrical button disposed on the pivot lever. The third electrical button is disposed on the pivot lever.

Abstract: A dual control lever includes a fixed base, a brake lever, a pivot lever, a first electrical button, a second electrical button, a third electrical button and a fourth electrical button. The brake lever is pivoted on the fixed base. The pivot lever is rotatably close to the brake lever. The first electrical button is disposed on the pivot lever. The second electrical button disposed on the pivot lever. The third electrical button is disposed on the fixed base. The fourth electrical button is disposed on the fixed base.