An automatic bicycle drive train shifting apparatus comprising a bicycle drive chain derailer powered by a servo gearmotor slaved to an electronic control system and controlled through a highly adaptable user interface serving to automatically alternate drive chain position between available bicycle drive sprockets under user defined shifting criteria adaptable in real time to rider conditioning, comfort level and road conditions thereby alleviating manual shifting tasks and achieving optimal pedal rate and effort settings for the rider.

A bicycle hub system, method and device including rear and front hub assemblies. Both the rear and front hub assemblies include locking mechanisms with matching undulating splined coupling faces that correspond to complementary undulating splined coupling faces of a wheel hub.

A bicycle hub system, method and device including rear and front hub assemblies. Both the rear and front hub assemblies include locking mechanisms with matching undulating splined coupling faces that correspond to complementary undulating splined coupling faces of a wheel hub.

A bicycle rear derailleur is basically provided a base member, a movable member, a chain guide and a resistance applying structure. The base member is configured to be mounted to a bicycle. The movable member is movably coupled to the base member. The chain guide is rotatably coupled to the movable member around a first rotational axis. The resistance applying structure includes a friction applying member that applies a frictional resistance to rotational movement of the chain guide. The resistance applying structure is offset from the first rotational axis.

A bicycle rear derailleur is basically provided a base member, a movable member, a chain guide and a resistance applying structure. The base member is configured to be mounted to a bicycle. The movable member is movably coupled to the base member. The chain guide is rotatably coupled to the movable member around a first rotational axis. The resistance applying structure includes a friction applying member that applies a frictional resistance to rotational movement of the chain guide. The resistance applying structure is offset from the first rotational axis.

An electronic rear derailleur includes a driving unit, a gearbox, a base portion, and a derailleur portion. The gearbox includes a biasing member, a first power gear, a second power gear, a first passive gear, and a second passive gear. The first power gear connects with the driving unit. Force is transmitted from the first power gear to the second power gear through the biasing member. The second power gear meshes the first passive gear and the second passive gear. The first passive gear and the second passive gear are respectively used to allow relative rotation between the gearbox and the derailleur portion with respect to the base portion, whereby the chain of a bicycle can be moved to engage with different sprockets to achieve the purpose of shifting.

An electronic rear derailleur includes a driving unit, a gearbox, a base portion, and a derailleur portion. The gearbox includes a biasing member, a first power gear, a second power gear, a first passive gear, and a second passive gear. The first power gear connects with the driving unit. Force is transmitted from the first power gear to the second power gear through the biasing member. The second power gear meshes the first passive gear and the second passive gear. The first passive gear and the second passive gear are respectively used to allow relative rotation between the gearbox and the derailleur portion with respect to the base portion, whereby the chain of a bicycle can be moved to engage with different sprockets to achieve the purpose of shifting.

A bicycle derailleur includes following features. A chain guiding portion is adapted to be engaged with a bicycle chain and is adapted to guide a drive direction of the bicycle chain. A connecting portion is connected to a fixed portion and the chain guiding portion. A movable portion is pivotally connected to the connecting portion and the chain guiding portion. The movable portion includes a pressing member, a base, and a sprag clutch. The sprag clutch is disposed between the pressing member and the base. The pivot shaft is connected to the movable portion and the chain guiding portion, and is rotatably disposed through the pressing member, the sprag clutch and the base. The sprag clutch is driven to rotate when the pivot shaft rotates along the direction. The pressing member is adapted to press the sprag clutch to increase rotational resistance of the chain guiding portion.

A rear derailleur assembly for mounting to a bicycle, wherein the bicycle includes a frame, includes an upper body for operationally engaging the rear derailleur assembly to the frame. The rear derailleur assembly also include a chain cage for engaging a chain of the bicycle; a controller pivotally connected to the upper body; and a lower body operationally connected to the chain cage, pivotally connected to the controller, and pivotally connected to the chain cage. The lower body includes a damper assembly for providing rotational resistance as the chain cage rotates in a first direction about the pivot axis.

A bicycle derailleur is basically provided with a base member, a movable member, a link structure and a cable interactive structure. The link structure is configured to movably connect the movable member relative to the base member. The cable interactive structure is provided on the link structure. The cable interactive structure includes a chain barrier portion. The chain barrier portion is configured to prevent a chain from contacting the link structure.