Abstract: A bicycle brake lever includes a main body, a brake assembly, and a valve. The main body includes a casing and a cover mounted on the casing. The casing has a storage chamber and a hydraulic chamber. The brake assembly includes a lever, a link, and a piston. The lever is pivotally disposed on the casing, the link connects the lever and the piston, the link is disposed through the cover, the piston is movably located in the hydraulic chamber and has an inner channel in fluid communication with the storage chamber. The valve is movably disposed on the casing. The valve is partially located in the hydraulic chamber. When the piston is moved from an initial position to a sealed position, the valve blocks the inner channel of the piston, such that the hydraulic chamber is not in fluid communication with the storage chamber.

Abstract: A bicycle control device is configured to be mounted on a handlebar and control a bicycle component. The bicycle control device includes a casing, a first switch assembly and a first lever. The casing is configured to be mounted on the handlebar and having an accommodation space. The first switch assembly is disposed in the accommodation space of the casing and configured to be electrically connected to the bicycle component. The first lever is pivotally disposed on the casing so as to be pivotable along a first direction to activate the first switch assembly and be pivotable along a second direction opposite to the first direction to activate the first switch assembly.

Abstract: A bicycle hydraulic assembly includes a casing, a first piston, and a second piston. The casing has a hydraulic chamber, an inlet channel, and an outlet channel connected to the hydraulic chamber. The first piston is located in the hydraulic chamber. The second piston is sleeved on the first piston. The second piston has a first end portion and a second end portion opposite to each other. The first end portion is wider than the second end portion located farther away from the inlet channel than the first end portion. When the first piston is moved a distance smaller than a threshold distance, the first piston is moved relative to the second piston while the second piston is stationary relative to the casing. When the first piston is moved a distance greater than the threshold distance, the first piston forces the second piston to move relative to the casing.

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: A method for controlling a derailleur in low battery remaining capacity includes determining whether a remaining capacity of a first battery of the derailleur is smaller than or equal to a first derailleur battery threshold. When the remaining capacity of the first battery is determined to be smaller than or equal to the first derailleur battery threshold, at least one of gear positions of the derailleur is invalided and non-selectable by the derailleur.

Abstract: The disclosure provides an anti-lock brake device including an oil pressure tank, a valve, and a movable component. The oil pressure tank has an accommodation space, an oil inlet channel, and an oil outlet channel connected to the accommodation space. The valve is slidably located in the oil inlet channel and for sealing or opening an oil inlet of the oil inlet channel. The movable component is located in the accommodation space and has a connecting channel corresponding to the oil inlet and an oil outlet of the oil outlet channel. When the movable component is slid to a depressurized position, the movable component is moved away from the valve for sealing the oil inlet, a first volume is produced between the connecting channel and the oil inlet, and a second volume, smaller than the first volume, is removed from between the connecting channel and the oil outlet.

Abstract: A bicycle rear derailleur is configured to be mounted on a wheel shaft on a bicycle frame. The bicycle rear derailleur includes a base component, a movable component, a linkage assembly, a chain guide, and a mount assembly. The base component is configured to be mounted on the bicycle frame. Two opposite ends of the linkage assembly are pivotally disposed on the base component and the movable component respectively. The chain guide is pivotally disposed on the movable component. The mount assembly includes an adapter, a bushing, and a fastener. The adapter is configured to be fixed on the bicycle frame. The base component is stacked on the adapter. The bushing is configured to be disposed through the bicycle frame, the adapter and the base component and is configured for an insertion of the wheel shaft. The fastener is fastened on the bushing.

Abstract: The disclosure provides a bicycle front derailleur including a fixed component, a chain guide, a first link, a second link, and a driving assembly. Two opposite ends of the first link are respectively disposed on the fixed component and the chain guide. The two opposite ends of the second link are respectively disposed on the fixed component and the chain guide. The driving assembly includes a driving shaft, a push component, an output gear and a power source. The push component and the output gear are fixed on the driving shaft, the power source is disposed on the fixed component and connected to the output gear, the push component is in contact with the first link, and the power source is configured to drive the push component to pivot the first link with respect to the fixed component via the output gear and the driving shaft.

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 control device is configured to be mounted on a handlebar and control a bicycle component. The bicycle control device includes a casing, a first switch assembly and a first lever. The casing is configured to be mounted on the handlebar and having an accommodation space. The first switch assembly is disposed in the accommodation space of the casing and configured to be electrically connected to the bicycle component. The first lever is pivotally disposed on the casing so as to be pivotable along a first direction to activate the first switch assembly and be pivotable along a second direction opposite to the first direction to activate the first switch assembly.

Abstract: A brake system includes a first and a second hydraulic brake assembly, a first and a second switch and a first electronic brake assembly. The first hydraulic brake assembly includes a first brake caliper and a first brake lever connected to each other. The second hydraulic brake assembly includes a second brake caliper and a second brake lever connected to each other. The first switch is activated by the first brake lever when the first brake lever is operated. The second switch is activated by the second brake lever when the second brake lever is operated. The first electronic brake assembly is connected to the second hydraulic brake assembly. The first electronic brake assembly controls an oil pressure applied to the second brake caliper according to whether the first switch and the second switch are activated.

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 chain guide assembly configured to be mounted on a linkage assembly of a bicycle derailleur. The chain guide assembly includes an inner plate, an outer plate, a first connecting bridge and a second connecting bridge. The outer plate is spaced apart from the inner plate. Two opposite sides of the first connecting bridge are respectively connected to the inner plate and the outer plate. Two opposite sides of the second connecting bridge are respectively connected to the inner plate and the outer plate. The inner plate, the outer plate, the first connecting bridge, and the second connecting bridge are made of a single piece. In addition, the disclosure also provides a bicycle derailleur having the chain guide assembly and a structural reinforcement sheet of the chain guide assembly.

Abstract: A bicycle rear derailleur is configured to be mounted on a wheel shaft on a bicycle frame. The bicycle rear derailleur includes a base component, a movable component, a linkage assembly, a chain guide, and a mount assembly. The base component is configured to be mounted on the bicycle frame. Two opposite ends of the linkage assembly are pivotally disposed on the base component and the movable component respectively. The chain guide is pivotally disposed on the movable component. The mount assembly includes an adapter, a bushing, and a fastener. The adapter is configured to be fixed on the bicycle frame. The base component is stacked on the adapter. The bushing is configured to be disposed through the bicycle frame, the adapter and the base component and is configured for an insertion of the wheel shaft. The fastener is fastened on the bushing.

Abstract: The disclosure provides a bicycle caliper including a casing assembly and a plurality of pistons. The casing assembly has a first fluid inlet, a second fluid inlet, a first fluid channel, a plurality of piston chambers, and a second fluid channel. The first fluid channel has a first connection opening and a second connection opening opposite to each other. The first connection opening and the second connection opening of the first fluid channel are respectively in fluid communication with the first fluid inlet and the second fluid inlet. The first fluid channel penetrates through the piston chambers. Two opposite openings of the second fluid channel are respectively in fluid communication with the first connection opening and the second connection opening of the first fluid channel, and the second fluid channel does not penetrate through the piston chambers. The pistons are respectively and movably disposed in the piston chambers.

Abstract: A bicycle head is configured to be mounted on a bicycle frame. The bicycle head includes a vertical tube, a stem, a handlebar, a first brake lever, and a shift control box. One end of the stem is mounted on the vertical tube. The handlebar is fixed to another end of the stem. The first brake lever assembly is mounted on the handlebar. The first brake lever assembly includes a main body, a brake assembly, a shift switch, and a battery. The brake assembly and the battery are disposed on the main body, and the shift switch is disposed on the brake assembly. The shift control box is disposed on one of the vertical tube, the stem, and the handlebar and electrically connected to the battery and the shift switch.

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 derailleur shifting system comprise a front derailleur, a rear derailleur, an operating device and a controller. The front derailleur is configured to be controlled to shift among front gear positions. The rear derailleur is configured to be controlled to shift among rear gear positions. The operating device is configured to generate an operational instruction associated with one or both of the front derailleur and the rear derailleur. The controller is configured to control one or both of the front derailleur and the rear derailleur to shift according to the operational instruction, an estimated gear position table and a gear position control table. The estimated gear position table comprises an estimated front gear position of the front derailleur and an estimated rear gear position of the rear derailleur, and the gear position control table comprises matching relationships between the front gear positions and the rear gear positions.

Abstract: A bicycle brake lever includes a main body, a brake assembly, and a valve. The main body includes a casing and a cover mounted on the casing. The casing has a storage chamber and a hydraulic chamber. The brake assembly includes a lever, a link, and a piston. The lever is pivotally disposed on the casing, the link connects the lever and the piston, the link is disposed through the cover, the piston is movably located in the hydraulic chamber and has an inner channel in fluid communication with the storage chamber. The valve is movably disposed on the casing. The valve is partially located in the hydraulic chamber. When the piston is moved from an initial position to a sealed position, the valve blocks the inner channel of the piston, such that the hydraulic chamber is not in fluid communication with the storage chamber.

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.