A bicycle sprocket includes a plurality of sprocket teeth. The plurality of sprocket teeth includes at least one first tooth and at least one second tooth. The at least one first tooth has a first radial-tooth height. The at least one first tooth has a first chain-engaging axial width which is smaller than a first distance defined between opposed outer link plates of the bicycle chain and which is larger than a second distance defined between opposed inner link plates of the bicycle chain. The first radial-tooth height is greater than the first chain-engaging axial width. The at least one second tooth has a second radial-tooth height. The at least one second tooth has a second chain-engaging axial width. The second radial-tooth height is greater than the second chain-engaging axial width. The first radial-tooth height is greater than the second radial-tooth height.

A control system includes a controller configured to control an actuator and at least one transmission such that a chain is driven by the actuator and a shifting operation is performed by the at least one transmission. In a case where a pedal is operated during the shifting operation, the controller is configured to control the actuator so that the shifting operation is stopped in accordance with a result of comparison with a predetermined threshold.

A control system includes a controller configured to control an actuator and at least one transmission such that a chain is driven by the actuator and a shifting operation is performed by the at least one transmission. In a case where a pedal is operated during the shifting operation, the controller is configured to control the actuator so that the shifting operation is stopped in accordance with a result of comparison with a predetermined threshold.

Methods and apparatus for a composite bicycle front sprocket are disclosed herein. One embodiment discloses a composite bicycle front sprocket assembly having an outer assembly of a first material. The bicycle front sprocket assembly also has a center assembly of a second material. The center assembly is disposed at least partially within the outer assembly. The center assembly is irremovably coupled with the outer assembly. The center assembly is irremovably coupled with the outer assembly without an external fastening device to irremovably couple the center assembly with the outer assembly.

Methods and apparatus for a composite bicycle front sprocket are disclosed herein. One embodiment discloses a composite bicycle front sprocket assembly having an outer assembly of a first material. The bicycle front sprocket assembly also has a center assembly of a second material. The center assembly is disposed at least partially within the outer assembly. The center assembly is irremovably coupled with the outer assembly. The center assembly is irremovably coupled with the outer assembly without an external fastening device to irremovably couple the center assembly with the outer assembly.

A drive device for an electric bicycle has a shaft and a redirecting gearbox configured for coupling with an electric motor and the shaft so that a torque is transmittable from the motor to the shaft via the gearbox. The gearbox has a first gear element rotatable about a first axis and a second gear element coupled to the first. The second gear element can rotate about a second axis running at an angle to the first axis. A torque is transmittable from the first gear element to the shaft through a coupling therebetween. The device is configured to rotate the shaft in a first rotational direction relative to the first gear element. The first gear element is axially displaceable relative to the second gear element, parallel to the first axis, within predetermined limits, the gear elements remaining coupled to one another within the predetermined limits.

A drive device for an electric bicycle has a shaft and a redirecting gearbox configured for coupling with an electric motor and the shaft so that a torque is transmittable from the motor to the shaft via the gearbox. The gearbox has a first gear element rotatable about a first axis and a second gear element coupled to the first. The second gear element can rotate about a second axis running at an angle to the first axis. A torque is transmittable from the first gear element to the shaft through a coupling therebetween. The device is configured to rotate the shaft in a first rotational direction relative to the first gear element. The first gear element is axially displaceable relative to the second gear element, parallel to the first axis, within predetermined limits, the gear elements remaining coupled to one another within the predetermined limits.

A single-sprocket system for integration into a bicycle trainer, the system including a sprocket having teeth about a perimeter of the sprocket, a first planar side, and a second planar side, wherein the teeth of the sprocket are configured to engage a chain of a bicycle mounted to the bicycle trainer. The system further includes a first chain guide adjacent the first planar side of the sprocket, wherein the first chain guide is configured to re-engage the teeth of the sprocket with the chain when the chain has become disengaged from the teeth of the sprocket towards the first planar side, and a second chain guide adjacent the second planar side of the sprocket, wherein the second chain guide is configured to re-engage the teeth of the sprocket with the chain when the chain has become disengaged from the teeth of the sprocket towards the second planar side.

A tool (10) for lubricating a chain (50), e.g. of a motorbike or bicycle, includes a block that defines a chain passage (22) through the block for receiving the chain (50). A first lubricant channel (438) through the block can be used to apply lubricant (56) into the chain passage where it is directed onto the chain. A second lubricant channel (300) can collect excess lubricant to allow the lubricant to drain and be collected for tidier operation. Lubricant channels can be provided for both aerosol and liquid lubricants.

A kit of parts for converting a regular bicycle into an e-bike. The kit includes (i) an electric motive power unit having an external freewheeling sprocket drive assembly configured for demountable engagement with the bike's chain, (ii) a rechargeable battery and battery mount for providing electric power to the electric motive power unit, (iii) a mount bracket for demountably engaging therein the electric motive power unit and for demountably engaging there onto the battery mount, (iv) a power cable with an on/off switch and a demountable handlebar clamp for communication with the electric motive power unit, (v) a throttle control assembly configured for demountable engagement with the bike's handlebar; and (vi) a communication cable engagement with the throttle control assembly and the electric motive power unit and optionally, with a wheel sensor. The kit may additionally comprise a battery charger.