Abstract: An inner link plate for a bicycle chain is provided. The inner link plate may have a longitudinal centerline defining a longitudinal direction and comprising a first inner-link end portion including a first inner-link opening having a first inner-link center axis, a second inner-link end portion including a second inner-link opening having a second inner-link center axis parallel to the first inner-link center axis, and an inner-link intermediate portion interconnecting the first inner-link end portion and the second inner-link end portion. The first inner-link end portion may have an extended edge portion extending to be away from the second inner-link end portion in the longitudinal direction.

Abstract: A bicycle sprocket comprises sprocket teeth. The sprocket teeth include a first tooth and a second tooth. The first tooth has a chain-engaging axial width which is larger than a first distance defined between opposed inner link plates of a bicycle chain and which is smaller than a second distance defined between opposed outer link plates of the bicycle chain. The second tooth has a chain-engaging axial width which is larger than the first distance and which is smaller than the second distance. The first tooth and the second tooth are spaced apart from each other in a circumferential direction of the bicycle sprocket to define a space which is free of a tooth configured to engage with the bicycle chain.

Abstract: A sprocket is engageable with a chain having rollers. The sprocket includes a body and a tooth portion. The tooth portion has front and rear surfaces, a drive side surface and a non-drive side surface. The rear and front surfaces face in opposite axial directions. The drive side surface axially connects the front and rear surfaces on a downstream side. The non-drive side surface axially connects the front and rear surfaces on an upstream side. One of the front and rear surfaces has a first chamfered portion, which is formed in a radially outer portion of at least one tooth portion and tapered radially outward in the axial direction. The drive side surface has a first protrusion, which protrudes downstream in the drive rotation direction and is located radially outwardly from a contact position where the drive side surface contacts each of the rollers when the chain is driven.

Abstract: A bicycle crank arm includes a first member and a second member. The first member has a crank axle interacting portion and a first recessed part around the crank axle interacting portion. The second member is attached to the first member. The first member has a first side facing the second member and a second side opposite to the first side. The first recessed part is recessed from the second side toward the first side such that the first recessed part includes an attachment area attached to the second member on the first side.

Abstract: A bicycle crank axle assembly has first and second crank arms that are attached to opposite ends of a crank axle. The ends of the crank axle are non-rotatably disposed in axle mounting openings of the first and second crank arms. A first end of the crank axle has at least one axially extending first spline that protrudes radially outward from an outer peripheral surface of its middle body portion. The at least one axially extending first spline non-rotatably couples the crank axle to the first crank arm and prevents outward axial movement of the first crank arm away from the second crank arm. The second end portion of the crank axle has at least one recess that extend radially inward with respect to the outer peripheral surface of the middle body portion to form at least one axially extending second spline.

Abstract: A bicycle crank axle assembly has first and second crank arms that are attached to opposite ends of a crank axle. The ends of the crank axle are non-rotatably disposed in axle mounting openings of the first and second crank arms. A first end of the crank axle has at least one axially extending first spline that protrudes radially outward from an outer peripheral surface of its middle body portion. The at least one axially extending first spline non-rotatably couples the crank axle to the first crank arm and prevents outward axial movement of the first crank arm away from the second crank arm. The second end portion of the crank axle has at least one recess that extend radially inward with respect to the outer peripheral surface of the middle body portion to form at least one axially extending second spline.

Abstract: A bicycle crank axle assembly has first and second crank arms that are attached to opposite ends of a crank axle. The ends of the crank axle are non-rotatably disposed in axle mounting openings of the first and second crank arms. A first end of the crank axle has at least one axially extending first spline that protrudes radially outward from an outer peripheral surface of its middle body portion. The at least one axially extending first spline non-rotatably couples the crank axle to the first crank arm and prevents outward axial movement of the first crank arm away from the second crank arm. The second end portion of the crank axle has at least one recess that extend radially inward with respect to the outer peripheral surface of the middle body portion to form at least one axially extending second spline.

Abstract: A bicycle crank assembly is provided with a first sprocket, a second sprocket, a crank arm, a sprocket fixing structure and an alignment tube. The first sprocket includes a plurality of first teeth and at least one first mounting portion having a first mounting opening. The second sprocket includes a plurality of second teeth and at least one second mounting portion having a second mounting opening. The crank arm includes at least one sprocket attachment portion having a third mounting opening. The sprocket fixing structure secures the first and second sprockets to the crank arm via the first, second and third mounting openings. The alignment tube extends through at least two of the first, second and third mounting openings.

Abstract: An outer chain plate is configured to aid in downshifting such that a chain moves more smoothly from an outer chain ring (sprocket) to an inner chain ring (sprocket) with either no downshifting recess being provided on the outer chain ring or at least a shallower than normal downshifting recess being provided on the outer chain ring. At least a bottom part of the outer chain plate that faces a center axis of a sprocket when in use has a portion removed to minimize contact with outer chain ring when downshifting. Preferably, the bottom part of the outer chain plate has a chamfered outer edge portion along a cutout portion that defines a reduced area portion.

Abstract: A bicycle chainring is formed from a first member and an second member. The first member includes a center rotational axis, a crank attachment portion with a plurality of chainring attachment openings and an annular tooth portion with a plurality of chain engaging gear teeth. The second member disposed around the center rotational axis and is fixedly attached to overlie at least one of the crank attachment portion and the annular tooth portion to reinforce the first member without obstructing access to the chainring attachment openings.

Abstract: A bicycle chain wheel assembly is provided with a chainring mounting structure, at least one chainring, a plurality of fasteners and a plurality of fastener covering structures. The chainring mounting structure has an exterior facing side and an interior facing side with a plurality of chainring mounting openings on the exterior facing side. The chainring overlies one of the exterior and interior facing sides of the chainring mounting structure. The fasteners secure the chainring to the chainring mounting structure via the chainring mounting openings. The fastener covering structures overlie exterior portions of the fasteners to conceal the fasteners from view when viewed from the exterior facing side of the chainring mounting structure.

Abstract: A bicycle chain wheel assembly is provided with a chainring mounting structure, at least one chainring, a plurality of fasteners and a plurality of fastener covering structures. The chainring mounting structure has an exterior facing side and an interior facing side with a plurality of chainring mounting openings on the exterior facing side. The chainring overlies one of the exterior and interior facing sides of the chainring mounting structure. The fasteners secure the chainring to the chainring mounting structure via the chainring mounting openings. The fastener covering structures overlie exterior portions of the fasteners to conceal the fasteners from view when viewed from the exterior facing side of the chainring mounting structure.

Abstract: An outer chain plate is configured to aid in downshifting such that a chain moves more smoothly from an outer chain ring (sprocket) to an inner chain ring (sprocket) with either no downshifting recess being provided on the outer chain ring or at least a shallower than normal downshifting recess being provided on the outer chain ring. At least a bottom part of the outer chain plate that faces a center axis of a sprocket when in use has a portion removed to minimize contact with outer chain ring when downshifting. Preferably, the bottom part of the outer chain plate has a chamfered outer edge portion along a cutout portion that defines a reduced area portion.

Abstract: A bicycle chain has an outer link with two outer link plates, an inner link formed with two inner link plates and a link pin connecting adjacent ones of the together. The link plates are configured to aid in smoothly shifting a chain moves between sprockets. The outer link plates have the outer link peripheral edges that are shaped differently. One of the outer link plates has an exteriorly facing surface with a first chamfered outer edge portion extending along a section of its outer link peripheral edge at a first end portion and a first reduced area part having a reduced radial dimension with respect to a radial dimension of the first end portion lying along a longitudinal axis. The inner link plates have center connecting portions with different minimum widths.

Abstract: A bicycle chainring is formed from a first member and an second member. The first member includes a center rotational axis, a crank attachment portion with a plurality of chainring attachment openings and an annular tooth portion with a plurality of chain engaging gear teeth. The second member disposed around the center rotational axis and is fixedly attached to overlie at least one of the crank attachment portion and the annular tooth portion to reinforce the first member without obstructing access to the chainring attachment openings.

Abstract: A shift assist projection is provided on a large bicycle sprocket to assist in shifting a chain to the sprocket from an adjacent smaller sprocket. The shift assist projection extends axially from one side of the sprocket. The shift assist projection has an axially facing chain catching surface that faces the center plane and the teeth of the large sprocket to engage an outer link plate of the chain. The chain catching surface is preferably angled a varying amount relative to the center plane of the large sprocket. The chain catching surface preferably has a rearward most rotational edge that is located closer to the center plane than a forward most rotational edge as viewed substantially along a moving direction of the chain when the chain is being shifted from the smaller sprocket to the large sprocket.

Abstract: A bicycle crank is provided with a bicycle sprocket that includes a sprocket ring part and a fastening part. The sprocket ring part includes first and second lateral side surfaces with a plurality of sprocket teeth arranged around an outer periphery thereof. The sprocket ring part is constructed of metal. The fastening part is adapted to be fixedly coupled to a rotational drive unit such as the right crank arm of a bicycle. The fastening part is constructed of synthetic resin material that is at least partially molded integrally around the first and second lateral side surfaces of the sprocket ring part at an area located radially inwardly the sprocket teeth. Preferably, the sprocket ring part is provided with an anchor structure to facilitate non-rotatable engagement with fastening part. Preferably, the anchor structure includes through holes and/or protrusion and depression arrangement.