This invention relates to a tool for insertion into an aperture on a chainring of an electric bicycle, the tool comprising a body which is shaped to abut a pedal arm of the electric bicycle and a head which is shaped to be received by the aperture. This invention also relates to a chainring for an electric bicycle comprising an aperture which is shaped to receive a complementarily shaped tool. In addition, this invention relates to a kit comprising the chainring and the tool, as well as to a method of cleaning and/or lubricating a drivetrain of an electric bicycle using the tool and the chainring.

A bicycle crankset, which is adapted to connect to a chain, includes a chainring and a crankarm. The chainring has a plurality of teeth, a plurality of connecting bores of first noncircular motion path, and a plurality of connecting bores of circular motion path. The crankarm has a plurality of connecting arms to be selected to secured to the connecting bores of first noncircular motion path or the connecting bores of circular motion path. The chainring provides a first noncircular path of motion when the connecting arms of the crankarm are secured to the connecting bores of first noncircular motion path, and chainring provides a circular path of motion when the connecting arms of the crankarm are secured to the connecting bores of circular motion path.

A bicycle sprocket has a rotational center axis. The bicycle sprocket comprises a sprocket body and sprocket teeth. The sprocket teeth include at least one first tooth and at least one second tooth. The at least one first has a first radial-tooth height. The at least one second tooth is adjacent to the first tooth and disposed on a downstream side in a rotational driving direction of the bicycle sprocket. The at least one second tooth has a second radial-tooth height. The first radial-tooth height is greater than the second radial-tooth height. The at least one first tooth includes a tooth tip having an axial center plane in an axial direction. The axial center plane of the tooth tip is offset from the axial center plane of the sprocket body in the axial direction.

A bicycle sprocket has a rotational center axis. The bicycle sprocket comprises a sprocket body and sprocket teeth. The sprocket teeth include at least one first tooth and at least one second tooth. The at least one first has a first radial-tooth height. The at least one second tooth is adjacent to the first tooth and disposed on a downstream side in a rotational driving direction of the bicycle sprocket. The at least one second tooth has a second radial-tooth height. The first radial-tooth height is greater than the second radial-tooth height. The at least one first tooth includes a tooth tip having an axial center plane in an axial direction. The axial center plane of the tooth tip is offset from the axial center plane of the sprocket body in the axial direction.

A bicycle sprocket comprises sprocket teeth. The sprocket teeth include 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 an axial center plane in an axial direction parallel to the rotational center axis. The at least one second tooth is adjacent to the first tooth and disposed on a downstream side in a rotational driving direction of the bicycle sprocket. The at least one second tooth has a second radial-tooth height. The first radial-tooth height is greater than the second radial-tooth height. The at least one first tooth includes a tooth tip having an axial center plane in the axial direction. The axial center plane of the tooth tip is offset from the axial center plane of the first tooth in an axial direction.

A bicycle sprocket comprises sprocket teeth. The sprocket teeth include 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 an axial center plane in an axial direction parallel to the rotational center axis. The at least one second tooth is adjacent to the first tooth and disposed on a downstream side in a rotational driving direction of the bicycle sprocket. The at least one second tooth has a second radial-tooth height. The first radial-tooth height is greater than the second radial-tooth height. The at least one first tooth includes a tooth tip having an axial center plane in the axial direction. The axial center plane of the tooth tip is offset from the axial center plane of the first tooth in an axial direction.

A bicycle chain includes a plurality of link units in series connection, and each of the link units includes two outer link plates, two inner link plates, and a pin. Each outer link plate includes two outer plate end portions and an outer plate connecting portion between to the outer plate end portions, and each outer plate end portion has a bore. Each outer plate end portion of the outer link plate has two cut portions on an edge thereof. The cut portions of the outer link plates provides a space, which is helpful to derailing the chain onto another sprocket in a low interference and a fast and smooth way.

A continuously variable transmission (CVT) having a main shaft configured to support and position various components of the CVT. Shift cam discs cooperate with ball-leg assemblies to shift the transmission ration of the CVT. Load cam discs, a torsion disc, rolling elements, and a hub cap shell are configured to generate axial force, transmit torque, and manage reaction forces. In one embodiment, a splined input shaft and a torsion disc having a splined bore cooperate to input torque into the variator of the CVT. Among other things, various ball axles, axle-ball combinations, and reaction force grounding configurations are disclosed. In one embodiment, a CVT having axial force generation means at both the input and output elements is disclosed.

A continuously variable transmission (CVT) having a main shaft configured to support and position various components of the CVT. Shift cam discs cooperate with ball-leg assemblies to shift the transmission ration of the CVT. Load cam discs, a torsion disc, rolling elements, and a hub cap shell are configured to generate axial force, transmit torque, and manage reaction forces. In one embodiment, a splined input shaft and a torsion disc having a splined bore cooperate to input torque into the variator of the CVT. Among other things, various ball axles, axle-ball combinations, and reaction force grounding configurations are disclosed. In one embodiment, a CVT having axial force generation means at both the input and output elements is disclosed.

Toothed belt with an internal toothing and an external toothing and transmission with such a toothed belt. Tooth crests of the internal toothing comprise a rounded region with a cross section in the shape of a segment of a circle, and tooth crests of the external toothing comprise a rounded region with a cross section in the shape of a segment of a circle. A region between two adjacent tooth crests of the internal toothing is at least as wide as a tooth width of teeth of the internal toothing, and a region between two adjacent tooth crests of the external toothing is at least as wide as a tooth width of teeth of the external toothing.