A rear derailleur includes a base member mountable to a bicycle frame, a movable member movably coupled to the base member, and a pivot member rotatably coupled to the movable member. The rear derailleur also includes a chain guide assembly rotatably connected to the movable member via the pivot member. The rear derailleur includes a damper device disposed within the movable member. The damper device is operable to apply a damping force to the chain guide assembly when the chain guide assembly rotates. The damper device includes a friction member having a friction surface. A first portion of the friction surface is in frictional engagement with the pivot member, and a second portion of the friction surface is in frictional engagement with the movable member. The friction device is disposed within the movable member at a distance relative to the biasing device in an axial direction along the pivot member.

A rear derailleur includes a base member mountable to a bicycle frame, a movable member movably coupled to the base member, and a pivot member rotatably coupled to the movable member. The rear derailleur also includes a chain guide assembly rotatably connected to the movable member via the pivot member. The rear derailleur includes a damper device disposed within the movable member. The damper device is operable to apply a damping force to the chain guide assembly when the chain guide assembly rotates. The damper device includes a friction member having a friction surface. A first portion of the friction surface is in frictional engagement with the pivot member, and a second portion of the friction surface is in frictional engagement with the movable member. The friction device is disposed within the movable member at a distance relative to the biasing device in an axial direction along the pivot member.

A bicycle gearshift mechanism has a base element, a pivot mechanism, a movable element, and a chain guide arrangement. The pivot mechanism connects the base element to the movable element. The chain guide arrangement is connected, rotatably about a rotary axle, to the movable element. The base element comprises a first attachment end, which is coaxial with respect to the rear-wheel axle or axis, and a second attachment end for coupling to the pivot mechanism.

A bicycle gearshift mechanism has a base element, a pivot mechanism, a movable element, and a chain guide arrangement. The pivot mechanism connects the base element to the movable element. The chain guide arrangement is connected, rotatably about a rotary axle, to the movable element. The base element comprises a first attachment end, which is coaxial with respect to the rear-wheel axle or axis, and a second attachment end for coupling to the pivot mechanism.

The present invention relates to a chain guide for a bicycle rear derailleur comprising a cage, a guide pulley rotatably mounted to the cage, a circular tension pulley rotatably mounted to the cage, and means for connecting the chain guide to a movable member of a rear derailleur so as to move the chain guide with respect to a bicycle cassette, wherein the guide pulley and the tension pulley are adapted to be engageable with a bicycle chain and wherein the tension pulley is rotatably mounted to the cage by mounting means and an interposed bearing, wherein the mounting means of the tension pulley are arranged so as to be spaced from the center of rotation of the tension pulley and wherein the mounting means are stationary in respect to the cage in the mounted state of the chain guide.

The present invention relates to a chain guide for a bicycle rear derailleur comprising a cage, a guide pulley rotatably mounted to the cage, a circular tension pulley rotatably mounted to the cage, and means for connecting the chain guide to a movable member of a rear derailleur so as to move the chain guide with respect to a bicycle cassette, wherein the guide pulley and the tension pulley are adapted to be engageable with a bicycle chain and wherein the tension pulley is rotatably mounted to the cage by mounting means and an interposed bearing, wherein the mounting means of the tension pulley are arranged so as to be spaced from the center of rotation of the tension pulley and wherein the mounting means are stationary in respect to the cage in the mounted state of the chain guide.

A drive train for a human-powered vehicle comprises a drive unit, a sprocket arrangement, and a total gear range quotient. The drive unit includes a motor configured to impart propulsion to the human-powered vehicle. The sprocket arrangement is operatively coupled to the drive unit. The sprocket arrangement comprises a plurality of rear sprockets and a plurality of gear ratios respectively corresponding to the plurality of rear sprockets. The plurality of gear ratios includes a largest gear ratio and a smallest gear ratio. The total gear range quotient is obtained by dividing the largest gear ratio by the smallest gear ratio. The total gear range quotient is larger than 5.

A drive train for a human-powered vehicle comprises a drive unit, a sprocket arrangement, and a total gear range quotient. The drive unit includes a motor configured to impart propulsion to the human-powered vehicle. The sprocket arrangement is operatively coupled to the drive unit. The sprocket arrangement comprises a plurality of rear sprockets and a plurality of gear ratios respectively corresponding to the plurality of rear sprockets. The plurality of gear ratios includes a largest gear ratio and a smallest gear ratio. The total gear range quotient is obtained by dividing the largest gear ratio by the smallest gear ratio. The total gear range quotient is larger than 5.

The disclosure relates to a chain roller for a rear bicycle gearshift mechanism. The chain roller comprising a rotatory bearing, a toothed ring with teeth formed thereon, and a support structure which connects the rotary bearing and the toothed ring. The toothed ring and support structure are formed from different materials and are connected to one another radially and axially.

The disclosure relates to a chain roller for a rear bicycle gearshift mechanism. The chain roller comprising a rotatory bearing, a toothed ring with teeth formed thereon, and a support structure which connects the rotary bearing and the toothed ring. The toothed ring and support structure are formed from different materials and are connected to one another radially and axially.