Chain-rings set for bicycle including a first chain-ring and a second chain-ring, this latter formed by segments, which includes displacement means with axial component of the segments with respect to the first chain-ring such that they can be moved a the chain free zone ZLC and shift the chain among chain-rings, where the axial displacement means are formed by guiding means configured for guiding the segments such that the relative movement of the teeth of the segments with respect to the small chain-ring in its displacement from a first disengagement configuration to a second engagement configuration has a tangential component opposite to the forward direction.

Chain-rings set for bicycle including a first chain-ring and a second chain-ring, this latter formed by segments, which includes displacement means with axial component of the segments with respect to the first chain-ring such that they can be moved a the chain free zone ZLC and shift the chain among chain-rings, where the axial displacement means are formed by guiding means configured for guiding the segments such that the relative movement of the teeth of the segments with respect to the small chain-ring in its displacement from a first disengagement configuration to a second engagement configuration has a tangential component opposite to the forward direction.

A gearbox may include a drive spindle and several interconnected gear clusters arranged in a housing. A first of the gear clusters is coaxially fastened to the spindle, and has an outboard gear and an inboard gear. The first gear cluster drives a belt to operate one or more of the other gear clusters, and the inboard gear is physically divided into a plurality of segments. A shifting system for the gearbox includes an actuator configured to urge the segments of the inboard gear of the first gear cluster into and out of the plane of the belt, such that a gear ratio of the gearbox is changeable without displacing the belt out of the plane.

A multi-speed drive hub for a bicycle contains: a hub shaft, a speed-changing transmission, a speed shifter, and a sprocket set. The hub shaft is connected on a center of a wheel rim of the bicycle and includes a speed-changing transmission. The speed-changing transmission includes at least one drive element and an actuator for driving multiple force segments of the speed-changing transmission to rotate reciprocately. The speed shifter includes a fitting sleeve which has a third fixing orifice corresponding to the at least one drive element. The sprocket set includes multiple speed cassettes of different diameters and includes multiple spacing spaces, each of which is defined any two adjacent speed cassettes. The fitting sleeve has multiple ribs and multiple flexible sheets. Each drive elements includes multiple retainers, multiple columns, and multiple force segments.

A multi-speed drive hub for a bicycle contains: a hub shaft, a speed-changing transmission, a speed shifter, and a sprocket set. The hub shaft is connected on a center of a wheel rim of the bicycle and includes a speed-changing transmission. The speed-changing transmission includes at least one drive element and an actuator for driving multiple force segments of the speed-changing transmission to rotate reciprocately. The speed shifter includes a fitting sleeve which has a third fixing orifice corresponding to the at least one drive element. The sprocket set includes multiple speed cassettes of different diameters and includes multiple spacing spaces, each of which is defined any two adjacent speed cassettes. The fitting sleeve has multiple ribs and multiple flexible sheets. Each drive elements includes multiple retainers, multiple columns, and multiple force segments.

A gearbox may include a drive spindle and several interconnected gear clusters arranged in a housing. A first of the gear clusters is coaxially fastened to the spindle, and has an outboard gear and an inboard gear. The first gear cluster drives a chain to operate one or more of the other gear clusters, and the inboard gear is physically divided into a plurality of segments. A shifting system for the gearbox includes an actuator configured to urge the segments of the inboard gear of the first gear cluster into and out of the plane of the chain, such that a gear ratio of the gearbox is changeable without displacing the chain out of the plane.

A gearbox may include a drive spindle and several interconnected gear clusters arranged in a housing. A first of the gear clusters is coaxially fastened to the spindle, and has an outboard gear and an inboard gear. The first gear cluster drives a chain to operate one or more of the other gear clusters, and the inboard gear is physically divided into a plurality of segments. A shifting system for the gearbox includes an actuator configured to urge the segments of the inboard gear of the first gear cluster into and out of the plane of the chain, such that a gear ratio of the gearbox is changeable without displacing the chain out of the plane.

A floating drive system includes a floating disc and a floating flywheel, when the chain is offset on the floating flywheel, the floating disc is yawed on each sleeved disc axle, and the floating flywheel is yawed on the sleeved flywheel axle to maintain the linear offset of the chain.

A bicycle front shifting system includes operable to transmit a wireless signal, a crank assembly with two crank arms and a pedal on each of the two crank arms. The crank assembly is rotatable about a rotation axis. A front shift unit is coupled to the crank assembly and is rotatable about the rotation axis. The front shift unit includes a chain ring component with a big chain ring and a small chain ring. The small chain ring has a small diameter and the big chain ring has a big diameter that is larger than the small diameter. A shift mechanism is coupled to and rotatable with the chain ring component about the rotation axis. The shift mechanism is configured to receive the wireless signal from the shifter and to shift a chain between the big chain ring and the small chain ring according to the wireless signal.

A bicycle chain device that includes a mounting bracket configured to be affixed to a bicycle. The bicycle has a solitary bicycle front sprocket. A cage is movably mounted to the mounting bracket so that the cage is positioned adjacent to the front sprocket. The cage has a chain-receiving slot, through which a bicycle chain passes. The cage is configured to move in accordance with a shifting operation of a bicycle rear derailleur to maintain alignment with a chain to prevent the chain from falling off the sprocket.