A bicycle hub unit configured to be stably coupled to a frame of a bicycle includes a hub axle and a rotation restriction member. The hub axle is configured to be coupled to the frame of the bicycle. The rotation restriction member is configured to couple the hub axle to the frame so that rotation relative to the hub axle and the frame is restricted. At least one of the hub axle and the rotation restriction member has a cable guide structure configured to guide a cable, which electrically connects an electric component and an electronic component, in a region including the rotation restriction member in an axial direction parallel to a center longitudinal axis of the hub axle.

A bicycle hub unit configured to be stably coupled to a frame of a bicycle includes a hub axle and a rotation restriction member. The hub axle is configured to be coupled to the frame of the bicycle. The rotation restriction member is configured to couple the hub axle to the frame so that rotation relative to the hub axle and the frame is restricted. At least one of the hub axle and the rotation restriction member has a cable guide structure configured to guide a cable, which electrically connects an electric component and an electronic component, in a region including the rotation restriction member in an axial direction parallel to a center longitudinal axis of the hub axle.

A bicycle sprocket comprises a sprocket body, a plurality of sprocket teeth, at least one shifting facilitation area, at least one driving facilitation area, and at least one bump portion. The at least one shifting facilitation area is to facilitate at least one of a first shifting operation in which a bicycle chain is shifted from the bicycle sprocket toward a smaller sprocket adjacent to the bicycle sprocket in an axial direction parallel to a rotational center axis of the bicycle sprocket without another sprocket between the bicycle sprocket and the smaller sprocket, and a second shifting operation in which the bicycle chain is shifted from the smaller sprocket toward the bicycle sprocket. The at least one bump portion is provided in the at least one driving facilitation area.

A bicycle sprocket comprises a sprocket body, a plurality of sprocket teeth, at least one shifting facilitation area, at least one driving facilitation area, and at least one bump portion. The at least one shifting facilitation area is to facilitate at least one of a first shifting operation in which a bicycle chain is shifted from the bicycle sprocket toward a smaller sprocket adjacent to the bicycle sprocket in an axial direction parallel to a rotational center axis of the bicycle sprocket without another sprocket between the bicycle sprocket and the smaller sprocket, and a second shifting operation in which the bicycle chain is shifted from the smaller sprocket toward the bicycle sprocket. The at least one bump portion is provided in the at least one driving facilitation area.

A bicycle chain guide includes a base and a chain guide. The base is configured to be mounted to a bicycle that includes a solitary sprocket having a rotational center axis. The chain guide is disposed above the solitary bicycle sprocket in a mounted state where the base is mounted to the bicycle. The chain guide includes a first guide plate, a second guide plate, and a bridge. The first guide plate has a first guiding surface. The second guide plate is closer to the base than the first guide plate and has a second guiding surface facing the first guiding surface to define a chain guiding slot between the first guiding surface and the second guiding surface. The bridge connects the first guide plate and the second guide plate.

A bicycle chain guide includes a base and a chain guide. The base is configured to be mounted to a bicycle that includes a solitary sprocket having a rotational center axis. The chain guide is disposed above the solitary bicycle sprocket in a mounted state where the base is mounted to the bicycle. The chain guide includes a first guide plate, a second guide plate, and a bridge. The first guide plate has a first guiding surface. The second guide plate is closer to the base than the first guide plate and has a second guiding surface facing the first guiding surface to define a chain guiding slot between the first guiding surface and the second guiding surface. The bridge connects the first guide plate and the second guide plate.

Example bicycle sprocket assemblies are described herein. An example sprocket assembly includes a cassette formed by a plurality of sprockets arranged in increasing diameter order from a first end to a second end of the cassette opposite the first end. The cassette has a passageway extending between a first opening in the first end and a second opening in the second end to receive a driver hub. An outboard portion of the passageway is formed between a midpoint of the cassette and the first end of the cassette. The cassette further includes a torque transmitting profile located within the outboard portion of the passageway to interface with the driver hub. The sprocket assembly also includes a bushing to be disposed within the second opening to form a non-torque transmitting interface between the second end of the cassette and the driver hub.

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.

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.

A chainring assembly includes a chainring carrier adapted to be coupled to a crank arm. The chainring carrier is rotatable about a rotation axis, and includes an outer periphery having carrier threads. A chainring structure includes an inner periphery having chainring threads and an outer periphery comprising a plurality of teeth. The inner periphery of the chainring structure is threadably engaged with the outer periphery of the chainring carrier. In one embodiment, a power meter device includes a body having a torque input section and a torque output section, with the torque output section including an outer periphery having threads adapted to be coupled to a chainring structure.