A multi sprocket arrangement is configured for mounting on a driver of a bicycle wheel. The multi sprocket arrangement includes a plurality of adjacent sprockets each of the plurality of sprockets having a different number of teeth. The plurality of adjacent sprockets include a first sprocket having a first inner diameter which is larger than an outer diameter of a profile base of a carrier profile of the driver, and a second sprocket having a second inner diameter which is smaller than the outer diameter of the profile base of the carrier profile of the driver. The first sprocket and the second sprocket are connected together by welding.

A bicycle rear wheel sprocket arrangement which is rotatable about a common sprocket rotation axis that defines an axial direction and orthogonal to which are radial directions, comprising a plurality of sprockets of different sizes and number of teeth arranged coaxially along the sprocket rotation axis, which are connected to one another such that the sprockets jointly rotate about the sprocket rotation axis together, wherein the sprocket arrangement comprises a first partial arrangement that includes a largest sprocket, and a second partial arrangement that includes a plurality of sprockets formed integrally with one another. One partial arrangement has a plurality of elastically deformable latching formations that are in latching engagement with a plurality of mating latching formations of the other partial arrangement to prevent the two partial arrangements from separating in the axial direction.

A bicycle rear wheel sprocket arrangement which is rotatable about a common sprocket rotation axis that defines an axial direction and orthogonal to which are radial directions, comprising a plurality of sprockets of different sizes and number of teeth arranged coaxially along the sprocket rotation axis, which are connected to one another such that the sprockets jointly rotate about the sprocket rotation axis together, wherein the sprocket arrangement comprises a first partial arrangement that includes a largest sprocket, and a second partial arrangement that includes a plurality of sprockets formed integrally with one another. One partial arrangement has a plurality of elastically deformable latching formations that are in latching engagement with a plurality of mating latching formations of the other partial arrangement to prevent the two partial arrangements from separating in the axial direction.

A bicycle sprocket has a plurality of teeth arranged one after the other along a circumferential direction and a plurality of spaces each of which being arranged between two of said teeth. Said plurality of teeth includes at least one first gearshifting tooth and at least one second tooth arranged immediately downstream of said at least one first gearshifting tooth with reference to a rotation direction (R) of the sprocket during pedaling. Said plurality of spaces includes at least one first space defined between said at least one first gearshifting tooth and said at least one second tooth and having a predetermined circumferential extension and at least one second space arranged downstream of said at least one second tooth with reference to said rotation direction (R) and having a circumferential extension greater than that of said at least one first space.

A bicycle sprocket has a plurality of teeth arranged one after the other along a circumferential direction and a plurality of spaces each of which being arranged between two of said teeth. Said plurality of teeth includes at least one first gearshifting tooth and at least one second tooth arranged immediately downstream of said at least one first gearshifting tooth with reference to a rotation direction (R) of the sprocket during pedaling. Said plurality of spaces includes at least one first space defined between said at least one first gearshifting tooth and said at least one second tooth and having a predetermined circumferential extension and at least one second space arranged downstream of said at least one second tooth with reference to said rotation direction (R) and having a circumferential extension greater than that of said at least one first space.

In an electric-motor-assisted bicycle, a motor includes a motor output shaft including a helical gear provided thereon. A reduction gear includes a rotatable shaft and a cylindrical portion. The rotatable shaft extends through the cylindrical portion. A helical gear provided on the cylindrical portion engages the helical gear on the motor output shaft. The rotatable shaft includes a first large-diameter portion, a small-diameter portion and a second large-diameter portion. The reduction gear further includes a bush bearing between an end surface of the first large-diameter portion and an end surface of the second large-diameter portion in the axial direction of the rotatable shaft. The outer periphery of the bush bearing is fixed to the cylindrical portion. The inner periphery of the bush bearing slides in a circumferential direction relative to the small-diameter portion. The bush bearing moves in the axial direction.

In an electric-motor-assisted bicycle, a motor includes a motor output shaft including a helical gear provided thereon. A reduction gear includes a rotatable shaft and a cylindrical portion. The rotatable shaft extends through the cylindrical portion. A helical gear provided on the cylindrical portion engages the helical gear on the motor output shaft. The rotatable shaft includes a first large-diameter portion, a small-diameter portion and a second large-diameter portion. The reduction gear further includes a bush bearing between an end surface of the first large-diameter portion and an end surface of the second large-diameter portion in the axial direction of the rotatable shaft. The outer periphery of the bush bearing is fixed to the cylindrical portion. The inner periphery of the bush bearing slides in a circumferential direction relative to the small-diameter portion. The bush bearing moves in the axial direction.

Disclosed are bicycle chain rings for bicycles having specially shaped ramps with lifting surfaces for improved up-shifting performance. Additional embodiments of the bicycle chain rings of the present invention may be configured with one or more additional features formed within the chain rings including a transition slide, a tapered ramp face, a ramp bridge, a ramp lead, a trailing transition slide and a wear pin.

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 bicycle front derailleur is basically provided with a base member, a chain guide and a chain restricting abutment. The base member is configured to be mounted on a bicycle frame. The chain guide is configured to be movably coupled to the base member between a retracted position and an extended position to move a bicycle chain. The chain restricting abutment is configured to restrict the bicycle chain from moving in a radially outward direction of a rotational center axis of a bicycle front sprocket when the base member is mounted on the bicycle frame and the chain guide moves from the extended position toward the retracted position.