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.

A control device for controlling a transmission ratio between a traction means and a sprocket set rotatable about an axle may include at least two sprockets alternatively wrapped around by the traction means. At least one of the sprockets may include several independently adjustable rim segments. Adjustment of the rim segments in relation to a fixed plane may be effected by a control device in a direction substantially transverse to the plane. The control device includes at least one electrically actuatable control element, e.g., a servomotor. The at least one control element is configured to rotate with the sprockets.

A control device for controlling a transmission ratio between a traction means and a sprocket set rotatable about an axle may include at least two sprockets alternatively wrapped around by the traction means. At least one of the sprockets may include several independently adjustable rim segments. Adjustment of the rim segments in relation to a fixed plane may be effected by a control device in a direction substantially transverse to the plane. The control device includes at least one electrically actuatable control element, e.g., a servomotor. The at least one control element is configured to rotate with the sprockets.

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 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 driving assembly is basically provided with a first sprocket cluster, a second sprocket cluster and a first actuator. The first sprocket cluster includes at least one first sprocket configured to be rotatable about a rotational axis. The second sprocket cluster includes at least one second sprocket configured to be rotatable about the rotational axis. The first actuator is configured to move the first sprocket cluster and the second sprocket cluster relative to one another in an axial direction of the rotational axis.

A bicycle driving assembly is basically provided with a first sprocket cluster, a second sprocket cluster and a first actuator. The first sprocket cluster includes at least one first sprocket configured to be rotatable about a rotational axis. The second sprocket cluster includes at least one second sprocket configured to be rotatable about the rotational axis. The first actuator is configured to move the first sprocket cluster and the second sprocket cluster relative to one another in an axial direction of the rotational axis.

A chainring includes a first chainring segment and a second chainring segment for a chainring arrangement of a bicycle. Further provided is a chainring arrangement and a drive arrangement for a bicycle with at least one chainring. The segmented chainring arrangement is particularly suitable for bicycles with only one front chainring.

A chainring includes a first chainring segment and a second chainring segment for a chainring arrangement of a bicycle. Further provided is a chainring arrangement and a drive arrangement for a bicycle with at least one chainring. The segmented chainring arrangement is particularly suitable for bicycles with only one front chainring.

A bicycle drive train comprises a sprocket assembly and a floating sprocket. The sprocket assembly comprises a first rotational center axis, a first sprocket, and a second sprocket. The first sprocket includes at least one first sprocket tooth and at least one first axially displaceable tooth with respect to the first rotational center axis. The second sprocket includes at least one second sprocket tooth. The at least one first axially displaceable tooth is displaceable relative to the at least one first sprocket tooth toward the at least one second sprocket tooth. The floating sprocket comprises a second rotational center axis and an axially sliding surface. The axially sliding surface is to support the floating sprocket movably relative to the sprocket assembly in an axial direction with respect to the second rotational center axis.