A bicycle derailleur comprises a base member adapted to be mounted to a bicycle; a movable member movably coupled to the base member; a chain guide coupled to the movable member through a pivot shaft for rotating around an axis (X); a spring mounted around the axis (X), wherein the spring is configured to bias the chain guide in a selected rotational direction; and a resistance applying unit disposed on the pivot shaft. The resistance applying unit includes a friction unit, a one-way transmission unit, and an adjusting unit. The friction unit includes a plurality of first engaging members and at least one second engaging member, wherein the plurality of first engaging members are axially slidable with respect to the pivot shaft. The adjusting unit adjusts an amount of friction between the plurality of first engaging members and the at least one second engaging member.

A bicycle derailleur comprises a base member adapted to be mounted to a bicycle; a movable member movably coupled to the base member; a chain guide coupled to the movable member through a pivot shaft, wherein the chain guide is coupled for rotation around a rotational axis (X); a biasing element that biases the chain guide in a selected rotational direction around the rotational axis (X); and a resistance applying unit that applies a resistance to rotational movement of the chain guide in a direction opposite the selected rotational direction. The resistance applying unit includes a roller clutch disposed between the movable member and the pivot shaft, wherein the roller clutch includes a roller; an intermediate member disposed between the roller and the pivot shaft, wherein the intermediate member moves relative to the pivot shaft; and a first friction member including a first contact area that is substantially perpendicular to the rotational axis (X), wherein the first friction member communicates rotational force between the pivot shaft and the intermediate member.

A derailleur basically includes a base member, a movable member, a linkage assembly, a power source receiving part and a cover member. The power source receiving part is provided to at least one of the base member, the movable member and the linkage assembly. The power source receiving part receives a power source. The cover member is movable in a first direction to switch from a cover detachment state and a cover attachment state in which the cover member at least partially covers the power source receiving part. The cover member includes first and power source contact surfaces. The first power source contact surface contacts the power source in a holding state where the power source is held in the power source receiving part. The second power source contact surface contacts the power source during an operation for moving the cover member in the first direction.

A bracket device is configured to mount a bicycle rear derailleur on a rear-wheel axis of a bicycle. The bracket device includes a frame attachment end for coupling to a bicycle frame and a derailleur attachment end for coupling to the bicycle rear derailleur. The frame attachment end has a first arm and a second arm, which are spaced apart in an axial direction with respect to the rear-wheel axis. The first arm has a first attachment opening through which the rear-wheel axis coaxially passes in a mounting state of the bracket device. The second arm has a second attachment opening through which the rear-wheel axis coaxially passes in the mounting state of the bracket device. The derailleur attachment end has a third attachment opening configured to receive a derailleur fastener for coupling to the base element of the bicycle rear derailleur.

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.

The disclosed embodiments include a drive structure. The drive structure includes a first sprocket and a second sprocket. Each of the first and second sprocket has a shape with two points and four sections of teeth where two sections of teeth are inline and two sections are curved. Attached to the first sprocket are slap crank arms, which contains a slap crank arm lever to move and cause an impact force when the first sprocket is rotated. A drive chain travels in a loop between the first sprocket and second sprocket. Embodiments of the drive structure include other elements of a bicycle frame and rear derailleur structure.

A rear derailleur includes a base member mountable to a bicycle frame, a movable member movably coupled to the base member, and a pivot member rotatably coupled to the movable member. The rear derailleur also includes a chain guide assembly rotatably connected to the movable member via the pivot member. The rear derailleur includes a damper device disposed within the movable member. The damper device is operable to apply a damping force to the chain guide assembly when the chain guide assembly rotates. The damper device includes a friction member having a friction surface. A first portion of the friction surface is in frictional engagement with the pivot member, and a second portion of the friction surface is in frictional engagement with the movable member. The friction device is disposed within the movable member at a distance relative to the biasing device in an axial direction along the pivot member.

A bicycle derailleur includes a lower link member including a position-limiting structure, an external chain-guiding member, a damping shaft, a connection member and a C-shape spring. The external chain-guiding member, connected pivotally with the lower link member, controls a tension of a chain. The connection member is connected with the lower link member. The damping shaft, mounted at one side of the lower link member, is connected pivotally with the external chain-guiding member. The C-shape spring, sleeving the damping shaft, includes a C-clip portion and a first plate portion disposed between the connection member and the position-limiting structure. The first plate portion is extended outward from one end of the C-clip portion in a direction leaving the damping shaft. A friction force upon the external chain-guiding member in the direction to relax the chain is greater than that in the direction to relax the chain.

A bicycle rear derailleur is basically provided with a chain guide and an indicator. The chain guide includes a guide pulley. The indicator is provided on the chain guide such that the indicator disposed on or in an outer periphery of the chain guide. The indicator is indicative of a setting position of an outer circumference of a sprocket of a bicycle rear sprocket assembly relative to the guide pulley.

A rear derailleur is configured as a hierarchical, at least two-level modular construction system and comprises at least several of the modules: base element module, swivel formation module, shifting element module, and chain guiding device module. At least one of the modules is replaceable and handleable in one piece. At least one of the modules includes at least one sub-assembly that is replaceable and handleable in one piece. In an embodiment the modular construction system is configured to use at least one family of sub-assemblies comprising at least two family members within at least one of the modules. Detachable connection interfaces of the family members to adjacent sub-assemblies of the module within the sub-assembly family are configured uniformly across family members for the respective sub-assembly family in such a way that a family member of the sub-assembly family of the module is exchangeable for another family member of the same sub-assembly family that, is for example, of different material, of different design, of different functionality or has different surface properties, while retaining the remaining sub-assemblies of the module.