A system including a base element of a rear derailleur and a mounting kit is described. The mounting kit has a mounting element for mounting the base element to a bracket portion of a bicycle frame. The first portion of the mounting element has a through hole that is associated and coaxial with the bracket mounting hole. The second portion of the mounting element has a base element mounting hole to which the base element of the rear derailleur is mounted. The mounting kit also has a retaining bolt having an internal thread into which an external thread of a through axle is screwed to fix the mounting element to the bracket portion. The first coupling formation is coupled to an end portion of the retaining bolt. The second coupling formation is radially offset from the first coupling formation and is coupled to the second portion of the mounting element.

A system including a base element of a rear derailleur and a mounting kit is described. The mounting kit has a mounting element for mounting the base element to a bracket portion of a bicycle frame. The first portion of the mounting element has a through hole that is associated and coaxial with the bracket mounting hole. The second portion of the mounting element has a base element mounting hole to which the base element of the rear derailleur is mounted. The mounting kit also has a retaining bolt having an internal thread into which an external thread of a through axle is screwed to fix the mounting element to the bracket portion. The first coupling formation is coupled to an end portion of the retaining bolt. The second coupling formation is radially offset from the first coupling formation and is coupled to the second portion of the mounting element.

A bicycle hub assembly comprises a hub axle, a hub shell, a sprocket support body, a first ratchet member, a second ratchet member, and a spacer. The hub shell includes at least one first tooth. The sprocket support body includes a first helical spline. The first ratchet member comprises at least one first ratchet tooth and a second helical spline engaged with the first helical spline. The second ratchet member comprises at least one second ratchet tooth and at least one second tooth. The at least one second tooth is engaged with the at least one first tooth. The spacer is at least partly provided between the at least one first tooth and the at least one second tooth in a circumferential direction defined about a rotational axis. The spacer includes a non-metallic material.

A gear change mechanism for a bicycle may involve a tensioner that has a wheel engaged with a chain in a bicycle drivetrain. This tensioner may be configured to rotate or otherwise change orientation in response to slack in the chain to maintain tension in the chain. A sensor may be used to measure the orientation of a tensioner of a chain in a bicycle drivetrain, and/or the physical orientation of components indicative thereof. Actions may be triggered by signals generated by the sensor.

A bicycle hub assembly comprises a hub axle, a hub shell, and a sprocket support body. The sprocket support body includes a tubular part, a first sprocket engaging tooth, and a second sprocket engaging tooth. The tubular part includes an outer peripheral surface and an attachment portion. The first sprocket engaging tooth includes a first radially outer surface provided radially outward of the outer peripheral surface. The second sprocket engaging tooth includes a second radially outer surface and a third radially outer surface. The third radially outer surface is provided radially outward of the outer peripheral surface and radially inward of the second radially outer surface. A first distance is defined from the outer peripheral surface to the first radially outer surface. A second distance is defined from the outer peripheral surface to the third radially outer surface. The second distance is shorter than the first distance.

A bicycle drivetrain (3) system for a road bicycle (2), comprising: a transmission assembly (14) having at least two selectable transmission ratios, a single chainring (9) having chainring teeth (10) for engagement with the bicycle chain (7), the chainring teeth (10) being arranged along a chainring (9) circumference, and a cogset (4) comprising a plurality of sprockets (5) each having respective sprocket teeth (6) for engagement with a bicycle chain (7) which defines a minimal interteeth distance, the sprocket teeth (6) being arranged along a respective sprocket (5) circumference, wherein a smallest respective sprocket (5) circumference of any such sprocket (5) of the cogset (4) corresponds to at least twelve times the minimal interteeth distance.

A bicycle drivetrain (3) system for a road bicycle (2), comprising: a transmission assembly (14) having at least two selectable transmission ratios, a single chainring (9) having chainring teeth (10) for engagement with the bicycle chain (7), the chainring teeth (10) being arranged along a chainring (9) circumference, and a cogset (4) comprising a plurality of sprockets (5) each having respective sprocket teeth (6) for engagement with a bicycle chain (7) which defines a minimal interteeth distance, the sprocket teeth (6) being arranged along a respective sprocket (5) circumference, wherein a smallest respective sprocket (5) circumference of any such sprocket (5) of the cogset (4) corresponds to at least twelve times the minimal interteeth distance.

A bicycle hub assembly comprises a hub axle, a hub shell, a sprocket support body, a first ratchet member, a second ratchet member, and a holding member. The sprocket support body includes a first helical spline. The first ratchet member includes at least one first ratchet tooth, and a second helical spline configured to mate with the first helical spline. The second ratchet member includes at least one second ratchet tooth configured to mate with the at least one first ratchet tooth, and a hub shell engagement portion configured to engage with the hub shell. The holding member is configured to hold an assembled state where the sprocket support body. The first ratchet member and the second ratchet member are assembled as a single unit.

A bicycle electrical component assembly is basically provided with a bicycle electrical component, a power supply unit and a power supply bracket. The bicycle electrical component includes a movable member and an electrical actuation unit. The electrical actuation unit includes an electrical actuator that is operatively coupled to the movable member to actuate the movable member. The power supply unit is electrically connected to the electrical actuation unit to supply an electrical power to the electrical actuation unit. The power supply bracket is configured to mount the power supply unit to the bicycle electrical component. At least one of the power supply unit and the power supply bracket includes at least one of an electrical cable and an electrical port that is configured to be connected to an electrical cable.

A bicycle hub assembly comprises a hub axle, a hub shell, a sprocket support body, a first ratchet member, a second ratchet member, and a spacer. The hub shell includes at least one first tooth. The sprocket support body includes a first helical spline. The first ratchet member comprises at least one first ratchet tooth and a second helical spline engaged with the first helical spline. The second ratchet member comprises at least one second ratchet tooth and at least one second tooth. The at least one second tooth is engaged with the at least one first tooth. The spacer is at least partly provided between the at least one first tooth and the at least one second tooth in a circumferential direction defined about a rotational axis. The spacer includes a non-metallic material.