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 in accordance with a permitted cadence range and a first threshold of the driving torque.

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 in accordance with a permitted cadence range and a first threshold of the driving torque.

Abstract: A derailleur comprises a base member, a movable member, a linkage structure, a pulley assembly, and a rotational force control structure configured to control rotational force of the pulley assembly relative to the movable member. The pulley assembly is pivotally movable relative to the movable member about a pivot axis in first and second directions. The pulley assembly is configured to move in the first direction upon moving from a second pivotal position toward a first pivotal position. The rotational force control structure includes a cam member having a first cam surface, an abutment member configured to abut the first cam surface, and a biasing member configured to bias the abutment member. The abutment member is configured to abut the first cam surface by the biasing member to apply first additional force to the pulley assembly in the first direction while the pulley assembly is in the first pivotal position.

Abstract: A bicycle rear sprocket assembly comprises a first sprocket and a second sprocket. The first sprocket includes a first torque-transmitting profile disposed around a first sprocket opening. The second sprocket includes a second torque-transmitting profile disposed around a second sprocket opening. The first torque-transmitting profile is configured to engage with the second torque-transmitting profile in the mounted state. The first sprocket includes an axial abutment surface configured to axially abut against the second sprocket for axially positioning the first sprocket and the second sprocket relative to each other in the mounted state. The axial abutment surface is disposed farther from an axial center plane of the bicycle rear hub assembly than the first torque-transmitting profile in the mounted state.

Abstract: A bicycle derailleur comprises a base member, a movable member, a pulley assembly, a rotational-force adjustment structure, an electric actuator, and a controller. The rotational-force adjustment structure is at least partly disposed between the movable member and the pulley assembly so as to apply resistance to rotation of the pulley assembly relative to the movable member. The electric actuator is configured to operate the rotational-force adjustment structure. The controller is configured to control the electric actuator based on a driving-force related information.

Abstract: A derailleur comprises a base member configured to be attached to a human-powered vehicle frame, a movable member movable relative to the base member, a pulley assembly configured to be pivotally attached to the movable member with respect to a pivot axis, and a biasing member configured to apply biasing force to the pulley assembly. The biasing member includes a first biasing member and a second biasing member.

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 first inner-link end portion overlaps with a tooth of a sprocket when viewed in the axial direction to provide an overlapping area in a state where the bicycle chain is engaged with the sprocket. The overlapping area has a maximum circumferential length equal to or larger than 0.45 mm.

Abstract: A bicycle transmission control device comprises a controller configured to control an operating speed of a bicycle derailleur based on a running speed of a bicycle and a gear ratio of the bicycle.

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: A bicycle rear sprocket assembly comprises a first sprocket and a second sprocket. The first sprocket includes a first torque-transmitting profile disposed around a first sprocket opening. The second sprocket includes a second torque-transmitting profile disposed around a second sprocket opening. The first torque-transmitting profile is configured to engage with the second torque-transmitting profile in the mounted state. The first sprocket includes an axial abutment surface configured to axially abut against the second sprocket for axially positioning the first sprocket and the second sprocket relative to each other in the mounted state. The axial abutment surface is disposed farther from an axial center plane of the bicycle rear hub assembly than the first torque-transmitting profile in the mounted state.

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 derailleur comprises a base member configured to be attached to a human-powered vehicle frame, a movable member movable relative to the base member, a pulley assembly configured to be pivotally attached to the movable member with respect to a pivot axis, and a biasing member configured to apply biasing force to the pulley assembly. The biasing member includes a first biasing member and a second biasing member.

Abstract: A derailleur comprises a base member, a movable member, a linkage structure, a pulley assembly, and a rotational force control structure configured to control rotational force of the pulley assembly relative to the movable member. The pulley assembly is pivotally movable relative to the movable member about a pivot axis in first and second directions. The pulley assembly is configured to move in the first direction upon moving from a second pivotal position toward a first pivotal position. The rotational force control structure includes a cam member having a first cam surface, an abutment member configured to abut the first cam surface, and a biasing member configured to bias the abutment member. The abutment member is configured to abut the first cam surface by the biasing member to apply first additional force to the pulley assembly in the first direction while the pulley assembly is in the first pivotal position.

Abstract: A bicycle derailleur comprises a base member, a movable member, a pulley assembly, a rotational-force adjustment structure, an electric actuator, and a controller. The rotational-force adjustment structure is at least partly disposed between the movable member and the pulley assembly so as to apply resistance to rotation of the pulley assembly relative to the movable member. The electric actuator is configured to operate the rotational-force adjustment structure. The controller is configured to control the electric actuator based on a driving-force related information.

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 in accordance with a permitted cadence range and a first threshold of the driving torque.

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 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 transmission control device comprises a controller configured to control an operating speed of a bicycle derailleur based on a running speed of a bicycle and a gear ratio of the bicycle.

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 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.