Disclosed is a rotation transmission mechanism including: an internal rotation member inserted by a crankshaft of a bicycle; and an external rotation member configured on the internal rotation member. The internal rotation member includes: an internal rotation member body. The external rotation member includes: a circular ring part configured at an outer side of the outer circumferential convex parts; and inner circumferential convex parts protruding to an inner circumferential side of the circular ring part and configured alternately with the outer circumferential convex parts. Elastic deformation parts are configured between the outer circumferential convex parts and the inner circumferential convex parts on a rotation direction side of the advancing outer circumferential convex parts. The outer circumferential convex parts are formed in such a manner that a surface on the rotation direction side is greater than a surface on an opposite side of the rotation direction.

A method of making a bicycle sprocket having a rotational center axis basically includes providing an annular portion and forming a first tooth and a second tooth. The annular portion is made of a base material and has a plurality of teeth. At least one of the teeth is processed to form a first tooth, and at least one other of the teeth is processed to form a second tooth. The first tooth has a first axial chain engaging width that is smaller than a first axial spacing of an outer link of a bicycle chain and larger than a second axial spacing of an inner link that is coupled to an outer link. The second tooth is formed to have a second axial chain engaging width that is smaller than the second axial spacing. The second tooth is formed by deforming the base material.

A bicycle sprocket assembly comprises a sprocket support member. The sprocket support member comprises a central cylindrical portion and a plurality of sprocket support portions. The plurality of sprocket support portions extends radially outwardly from the central cylindrical portion with respect to a rotational center axis of the bicycle sprocket assembly. At least one sprocket support portion of the plurality of sprocket support portions comprises at least one radially extending surface, at least one axially extending surface, and an interior cavity. The at least one radially extending surface extends radially relative to the rotational center axis to support at least one of the at least one sprocket. The at least one axially extending surface extends in an axial direction parallel to the rotational center axis.

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 arrangement for a bicycle includes a crank having a crank mounting portion, a front sprocket having a front sprocket mounting portion attached to the crank mounting portion and a front chain engaging portion, an axle assembly, a plurality of rear sprockets located about an axis of the axle assembly, a chain configured to engage with the front chain engaging portion of the front sprocket and the plurality of rear sprockets, a gear changer having a gear changer mounting unit located about the axis of the axle assembly and having a first mounting portion spaced apart from a second portion mounting portion. The gear changer is configured to move the chain between an axially innermost rear sprocket and an axially outermost rear sprocket and a control unit is configured to control movement of the gear changer.

A bicycle chainring structure is provided. The chainring structure includes a plurality of teeth disposed about the radially outer circumference of the chainring structure and a pairing feature including a wall forming a radially interior profile formed on the chainring structure, the radially interior profile defined by lobes extending radially inward. The chainring structure also includes a torque-transmitting coupling formed in the chainring structure, the torque-transmitting coupling including a plurality of chainring holes disposed in the radially inward extending lobes and configured to receive input torque from a crank arm and transmit the input torque to the plurality of teeth.

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 chainring for a bicycle includes a body and a plurality. The plurality of teeth are disposed about a periphery of the body. The plurality of teeth have a tooth body formed of a first material and include a load flank. The plurality of teeth also include an insert formed of a second material. The insert is coupled to a tooth body of the plurality of teeth forming a load flank surface of the plurality of teeth.

A front sprocket assembly basically includes a front sprocket, a sprocket carrier and at least one slide shaft. The front sprocket includes a sprocket body having at least one carrier mounting portion. The at least one carrier mounting portion has the at least one slide opening. The sprocket carrier includes at least one sprocket mounting portion. The at least one sprocket mounting portion has a first shaft-supporting portion and a second shaft-supporting portion. The at least one slide opening receives the at least one slide shaft between the first shaft-supporting portion and the second shaft-supporting portion.

A bicycle front sprocket assembly is basically provided with a first sprocket, a second sprocket, a sprocket carrier and a chain guiding portion. The first sprocket includes a first sprocket body and a plurality of first sprocket teeth disposed on a first outer periphery of the first sprocket body, The second sprocket includes a second sprocket body and a plurality of second sprocket teeth. The second sprocket teeth are disposed on a second outer periphery of the second sprocket body. The sprocket carrier includes a torque transmitting profile and a sprocket mounting portion. The chain guiding portion is positioned between the first and second sprockets in an axial direction parallel to a rotational center axis of the bicycle front sprocket assembly. At least one of the first and second sprockets is mounted to the sprocket mounting portion of the sprocket carrier by a non-threaded fastener.