A belt drive system comprising a belt having a plurality of longitudinally spaced belt teeth, the belt further comprising a longitudinal groove extending in the endless direction of the belt through the belt teeth, a sprocket comprising a plurality of sprocket teeth on an outer circumference of the sprocket, each of the sprocket teeth extending parallel to the rotation axis, and each sprocket tooth configured to be received between adjacent belt teeth, and a first planar fin extending from at least one side of a sprocket tooth, the first planar fin configured to cooperatively engage the longitudinal groove, the first planar fin extending in a direction normal to a sprocket axis of rotation, the first planar fin having a width no greater than 20% of a sprocket groove width (W).

An electric power-assisted bicycle, comprising: a torque sensor for detecting pedaling force applied to the pedal; an inclination angle sensor for detecting rocking of the bicycle body in a lateral direction; an electric motor that assists drive of a drive wheel driven by pedaling of the rider; and a controller that controls the electric motor based on the pedaling force. The controller has a first mode and a second mode as control modes of the electric motor. The second mode is executed when the controller determines that the rider pedals the bicycle while rocking the bicycle body in the lateral direction. The controller executes different control in the second mode from that in the first mode to assist the drive of the drive wheel.

An electrically actuated component of a bicycle includes a first controller configured to receive a data stream from a second controller. The data stream includes one or more packets received by the first controller. For each of the one or more packets received by the first controller, the first controller is configured to identify a number of the one or more packets of the data stream received by the first controller, and compare the identified number of packets to a predetermined threshold number of packets. After all packets of the one or more packets of the data stream have been received by the first controller, the first controller is configured to initiate, based on the respective comparison, an action of the electrically actuated component or another electrically actuated component of the bicycle when the identified number of packets is less than the predetermined threshold number of packets.

An electrically actuated component of a bicycle includes a first controller configured to receive a data stream from a second controller. The data stream includes one or more packets received by the first controller. For each of the one or more packets received by the first controller, the first controller is configured to identify a number of the one or more packets of the data stream received by the first controller, and compare the identified number of packets to a predetermined threshold number of packets. After all packets of the one or more packets of the data stream have been received by the first controller, the first controller is configured to initiate, based on the respective comparison, an action of the electrically actuated component or another electrically actuated component of the bicycle when the identified number of packets is less than the predetermined threshold number of packets.

A chain and an inner link plate for a bicycle chain having chain rollers is provided. A protrusion of the inner link plate in relation to the respectively assigned chain roller in a front lower longitudinal end region of an inner link plate outer periphery is reduced, in comparison to the protrusion in a front upper longitudinal end region and/or in a rear lower longitudinal end region of the inner link plate outer periphery.

A cycle is described in which an electric motor is coupled to a chainring or pedal sprocket via one or more chains or belts. The electric motor is also coupled to a sprocket of the rear wheel of the cycle. A clutch mechanism is further included between the linkage coupling the chainwheel and the electric motor such that either the electric motor, the pedals, or simultaneously both can drive the cycle. This design further allows the electric motor to be removed and the cycle to be pedaled normally.

A cycle is described in which an electric motor is coupled to a chainring or pedal sprocket via one or more chains or belts. The electric motor is also coupled to a sprocket of the rear wheel of the cycle. A clutch mechanism is further included between the linkage coupling the chainwheel and the electric motor such that either the electric motor, the pedals, or simultaneously both can drive the cycle. This design further allows the electric motor to be removed and the cycle to be pedaled normally.

A bicycle chain includes a pair of outer plates, a pair of inner plates, and a connecting pin assembly. The pair of outer plates defines a width of the bicycle chain in a transverse direction, and the pair of inner plates is positioned at least partially between the pair of outer plates. The connecting pin assembly connects the pair of outer plates with the pair of inner plates and includes a first rocker pin, a second rocker pin, and a center pin between the first rocker pin and the second rocker pin in a longitudinal direction. A length of the center pin in the transverse direction is less than the width of the bicycle chain.

A control device of a bicycle includes an actuator and a first controller. The first controller is configured to generate and transmit, from the first controller to a second controller of the bicycle, messages for a predetermined time period at a first transmission rate in response to activation of the actuator. The first controller is further configured to, after the predetermined period of time, generate and transmit, from the first controller to the second controller, one or more messages at a second transmission rate until the actuator is deactivated. The first transmission rate is greater than the second transmission rate, and each of the messages includes data identifying the activation of the actuator.

A control device of a bicycle includes an actuator and a first controller. The first controller is configured to generate and transmit, from the first controller to a second controller of the bicycle, messages for a predetermined time period at a first transmission rate in response to activation of the actuator. The first controller is further configured to, after the predetermined period of time, generate and transmit, from the first controller to the second controller, one or more messages at a second transmission rate until the actuator is deactivated. The first transmission rate is greater than the second transmission rate, and each of the messages includes data identifying the activation of the actuator.