Abstract: A bicycle sprocket assembly is basically provided that includes a sprocket support member, a first sprocket, a second sprocket that is a separate member from the first sprocket, and a third sprocket that is a separate member from the first and second sprockets. The sprocket support member is configured to support at least one of the first, second and third sprockets. The sprocket support member includes a plurality of sprocket support portions extending radially outwardly from a central cylindrical portion. A first reinforcement member is attached to at least one of the first and second sprockets, and extends between the first and second sprockets. A second reinforcement member is attached to at least one of the second and third sprockets, and extends between the second and third sprockets. Each of the first and second reinforcement members is disposed between an adjacent pair of the plurality of sprocket support portions.

Abstract: A shifting system for a human-powered vehicle comprises a controller. The controller is configured to receive a driving torque and a cadence of the human-powered vehicle from at least one sensor. The controller is configured to determine a permitted shift timing based on the driving torque and the cadence. The controller is further configured to control a shift mechanism to perform a gear shift during the permitted shift timing.

Abstract: A bicycle sprocket comprises a sprocket body, a plurality of sprocket teeth, an axially outward protuberance, and an axially inward protuberance. The axially outward protuberance is disposed on an outward facing side of the sprocket body to overlap at least partly with a bicycle chain engaging with a neighboring bicycle sprocket when viewed along a rotational center axis. The axially inward protuberance is disposed on an inward facing side of the sprocket body to overlap at least partly with the axially outward protuberance when viewed along the rotational center axis.

Abstract: A bicycle sprocket comprises a sprocket body and a plurality of sprocket teeth provided on an outer periphery of the sprocket body and including at least one first tooth and at least one second tooth. The at least one first tooth has a driving surface side and a non-driving surface side. The at least one first tooth has a bevel cut shape in the non-driving surface side. The bevel cut shape is configured to avoid initially engaging with a bicycle chain in a shifting operation where the bicycle chain shifts from an adjacent smaller bicycle sprocket to the bicycle sprocket. The at least one second tooth is configured to initially engage with the bicycle chain in the shifting operation. The at least one second tooth is disposed adjacent to the at least one first tooth in a circumferential direction with respect to a rotational center axis of the bicycle sprocket.

Abstract: A bicycle-chain outer link plate comprises a first outer-link end portion, a second outer-link end portion, and a first outer-link intermediate portion. The first outer-link end portion comprises a first outer-link opening and a first outer-link end outermost edge. The second outer-link end portion comprises a second outer-link opening and a second outer-link end outermost edge. The first outer-link intermediate portion comprises a first outer-link intermediate outermost edge and a first additional outer-link intermediate outermost edge. The first outer-link intermediate portion has a first distance defined in an axial direction on a first outer-link longitudinal axis. The first outer-link intermediate outermost edge has a second distance defined in the axial direction. The first outer-link end outermost edge has a third distance defined in the axial direction. The first distance is larger than the second distance and the third distance. The second distance is larger than the third distance.

Abstract: An outer link plate for a bicycle chain includes a first outer-link end portion, a second outer-link end portion and an outer-link intermediate portion interconnecting the first outer-link end portion and the second outer-link end portion. The first outer-link end portion includes a first outer-link opening having a first outer-link center axis. The second outer-link end portion includes a second outer-link opening having a second outer-link center axis parallel to the first outer-link center axis. The outer link plate has an outer-link longitudinal centerline. The outer-link intermediate portion has an outer-link outer surface and an outer-link inner surface that is opposite to the outer-link outer surface in an axial direction parallel to the first outer-link center axis. The outer-link intermediate portion includes an axial protrusion protruding from the outer-link inner surface in the axial direction. The axial protrusion is offset from the outer-link longitudinal centerline.

Abstract: A bicycle chain comprises a first outer link plate and a second outer link plate. A first outer-link longitudinal axis extends through a first outer-link center axis and a second outer-link center axis to divide a first outer surface into a first side and a second side when viewed in an axial direction. A second outer-link longitudinal axis extends through a third outer-link center axis and a fourth outer-link center axis to divide a second outer surface into a third side and a fourth side when viewed in the axial direction. The fourth side includes a first circumferential area and a first chamfer free area. The first circumferential area has a first angle equal to or larger than 20 degrees. The first chamfer free area is adjacent to the first circumferential area. At least one second chamfer is provided outside the first chamfer free area.

Abstract: A bicycle sprocket comprises a sprocket body, a plurality of sprocket teeth, and at least one upshifting facilitation area. The plurality of sprocket teeth extends radially outwardly from the sprocket body with respect to the rotational center axis. The plurality of sprocket teeth includes at least one axially recessed upshifting initiation tooth. The at least one axially recessed upshifting initiation tooth includes a driving surface, a non-driving surface and a tooth tip portion. The non-driving surface includes a non-driving surface protrusion disposed radially inwardly from a non-driving surface side tooth tip end with respect to a rotational center axis. The non-driving surface protrusion has a protrusion tip disposed closer to the second axially-facing surface than the non-driving-surface-side tooth tip end in the axial direction so that a guiding slope extends from the protrusion tip toward the first axially-facing surface.

Abstract: A bicycle chain comprises a first outer link plate. The first outer link plate comprises a first outer-link end portion, a second outer-link end portion, a first outer-link intermediate portion, and a first outer-link longitudinal centerline. The first outer-link end portion, the second outer-link end portion and the first outer-link intermediate portion define a first outer-link outer peripheral edge. The first outer-link outer peripheral edge comprises a first outer-link end edge, a second outer-link end edge, and a pair of first outer-link intermediate edges. A first radial distance is defined from a first outer-link center axis to the first outer-link end edge in a perpendicular direction. A minimum distance is defined between the pair of first outer-link intermediate edges in the perpendicular direction. The minimum distance is smaller than 200% of the first radial distance and is equal to or larger than 5 mm.

Abstract: A bicycle chain comprises an inner link plate. The inner link plate comprises a first inner-link end portion, a second inner-link end portion, an inner-link intermediate portion, a first chromized layer, and a second chromized layer. The first inner-link end portion includes a first inner-link opening and a first axially extending surface. The second inner-link end portion includes a second inner-link opening and a second axially extending surface. The first chromized layer has a first maximum axially chromized-treatment length defined in the first axially extending surface in an axial direction. The second chromized layer has a second maximum axially chromized-treatment length defined in the second axially extending surface in the axial direction. Each of the first maximum axially chromized-treatment length and the second maximum axially chromized-treatment length is equal to or larger than 1.1 mm.

Abstract: A bicycle rear sprocket comprises a sprocket body, a plurality of sprocket teeth, a shifting facilitation recess, and an upshifting facilitation projection. The plurality of sprocket teeth extends radially outwardly from the sprocket body. The shifting facilitation recess is to facilitate a shifting operation in which a bicycle chain is shifted between the bicycle rear sprocket and a smaller rear sprocket adjacent to the bicycle rear sprocket without another sprocket between the bicycle rear sprocket and the smaller rear sprocket. The upshifting facilitation projection is provided in the shifting facilitation recess to support the bicycle chain in an upshifting operation in which the bicycle chain is shifted from the bicycle rear sprocket to the smaller rear sprocket.

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 includes a base body, a first sprocket tooth and a shifting initiation tooth. The first sprocket tooth includes a drive surface including a drive surface side tooth tip end portion, a non-drive surface including a non-drive surface side tooth tip end portion and a tooth tip portion connecting the drive surface side tooth tip end portion and the non-drive surface side tooth tip end portion. The non-drive surface extends circumferentially with respect to the rotational center axis from the non-drive surface side tooth tip end portion toward a first surface. The tooth tip portion extends circumferentially in a first direction between the drive surface side tooth tip end portion and the non-drive surface side tooth tip end portion. The non-drive surface extends circumferentially from the non-drive surface side tooth tip end portion in a second direction that is inclined with respect to the first direction.

Abstract: A bicycle chain comprises a first outer link plate and a second outer link plate. A first outer-link longitudinal axis extends through a first outer-link center axis and a second outer-link center axis to divide a first outer surface into a first side and a second side when viewed in an axial direction. A second outer-link longitudinal axis extends through a third outer-link center axis and a fourth outer-link center axis to divide a second outer surface into a third side and a fourth side when viewed in the axial direction. The fourth side includes a first circumferential area and a first chamfer free area. The first circumferential area has a first angle equal to or larger than 20 degrees. The first chamfer free area is adjacent to the first circumferential area. At least one second chamfer is provided outside the first chamfer free area.

Abstract: A bicycle-chain outer link plate comprises a first outer-link end portion, a second outer-link end portion, and a first outer-link intermediate portion. The first outer-link end portion comprises a first outer-link opening and a first outer-link end outermost edge. The second outer-link end portion comprises a second outer-link opening and a second outer-link end outermost edge. The first outer-link intermediate portion comprises a first outer-link intermediate outermost edge and a first additional outer-link intermediate outermost edge. The first outer-link intermediate portion has a first distance defined in an axial direction on a first outer-link longitudinal axis. The first outer-link intermediate outermost edge has a second distance defined in the axial direction. The first outer-link end outermost edge has a third distance defined in the axial direction. The first distance is larger than the second distance and the third distance. The second distance is larger than the third distance.

Abstract: A bicycle sprocket comprises a sprocket body, a plurality of sprocket teeth, an axially outward protuberance, and an axially inward protuberance. The axially outward protuberance is disposed on an outward facing side of the sprocket body to overlap at least partly with a bicycle chain engaging with a neighboring bicycle sprocket when viewed along a rotational center axis. The axially inward protuberance is disposed on an inward facing side of the sprocket body to overlap at least partly with the axially outward protuberance when viewed along the rotational center axis.

Abstract: A bicycle rear sprocket assembly comprises a sprocket support and a first sprocket. The sprocket support includes a hub engagement part configured to engage with a bicycle hub assembly. The sprocket support includes a plurality of sprocket attachment members extending radially outwardly from the hub engagement part with respect to a rotational center axis of the bicycle rear sprocket assembly. The first sprocket is attached to the plurality of sprocket attachment members. The first sprocket includes a first sprocket body and a plurality of first sprocket teeth which extends radially outwardly from the first sprocket body with respect to the rotational center axis and a total number of which is equal to or larger than thirty-four. The first sprocket has a plurality of shifting facilitation areas. A total number of the plurality of shifting facilitation areas is a divisor of a total number of the plurality of sprocket attachment members.

Abstract: A bicycle chain comprises a first outer link plate. The first outer link plate comprises a first outer-link end portion, a second outer-link end portion, a first outer-link intermediate portion, and a first outer-link longitudinal centerline. The first outer-link end portion, the second outer-link end portion and the first outer-link intermediate portion define a first outer-link outer peripheral edge. The first outer-link outer peripheral edge comprises a first outer-link end edge, a second outer-link end edge, and a pair of first outer-link intermediate edges. A first radial distance is defined from a first outer-link center axis to the first outer-link end edge in a perpendicular direction. A minimum distance is defined between the pair of first outer-link intermediate edges in the perpendicular direction. The minimum distance is smaller than 200% of the first radial distance and is equal to or larger than 5 mm.

Abstract: A bicycle chain comprises a first inner link plate and a second inner link plate. The first inner link plate comprises a first inner-link end portion, a second inner-link end portion, and a first inner-link intermediate portion. The second inner link plate comprises a third inner-link end portion, a fourth inner-link end portion, and a second inner-link intermediate portion. A first inner-link end edge has a first chamfer extending about the first inner-link center axis such that a part of the first chamfer is disposed in a first circumferential area defined from a first inner-link longitudinal centerline to a first reference line when viewed in an axial direction of the first inner-link center axis. The first circumferential area is smaller than 14 degrees.

Abstract: An outer link plate for a bicycle chain is provided. The outer link plate has an interior surface configured to face another counterpart outer link plate in an assembled state and an exterior surface opposite to the interior surface. The outer link plate has an outer perimeter, and first and second end portions including respective first and second openings each having corresponding parallel center axes. An intermediate portion is provided interconnecting the first end portion and the second end portion. The intermediate portion has an axially recessed portion formed along the outer perimeter on the exterior surface, the intermediate portion having a pair of intermediate edges formed along the outer perimeter, the axially recessed portion being formed on at least one of the intermediate edges and including a chamfered portion connecting the at least one of the intermediate edges to the exterior surface of the outer link plate.