An electromechanical rear derailleur is provided for a bicycle, including a base member for attachment to the bicycle. A movable member has a cage assembly attached thereto. A linkage is provided that couples the movable member to the base member and operative to enable movement of the movable member relative to the base member in a direction substantially parallel to the mounting axis. A power source powers an motor module connected thereto to move the movable member and elements thereon.

A bicycle gearshift is operated by imposing on the chain guide a primary displacement in the axial direction with respect to a cogset, to move the chain between the sprockets. Simultaneously with imposing on the primary displacement imposing on the chain guide a secondary displacement in the radial direction with respect to the cogset. The secondary displacement is of a greater size when the primary displacement takes place in the area of the cogset with the larger sprockets whereas it is of a smaller size when the primary displacement takes place in the area of the cogset with the smaller sprockets.

A bicycle gearshift is operated by imposing on the chain guide a primary displacement in the axial direction with respect to a cogset, to move the chain between the sprockets. Simultaneously with imposing on the primary displacement imposing on the chain guide a secondary displacement in the radial direction with respect to the cogset. The secondary displacement is of a greater size when the primary displacement takes place in the area of the cogset with the larger sprockets whereas it is of a smaller size when the primary displacement takes place in the area of the cogset with the smaller sprockets.

A bicycle rear derailleur comprises a base member, a linkage structure, a movable member, a first pulley assembly, and a second pulley assembly. The first pulley assembly includes a first pulley support and a first toothed pulley. The first pulley support is pivotally coupled to the movable member about a first pivot axis. The first toothed pulley is rotatably coupled to the first pulley support about a first pulley axis spaced apart from the first pivot axis. The second pulley assembly includes a second pulley support, a second toothed pulley, and a third toothed pulley. The second pulley support is pivotally coupled to the movable member about a second pivot axis. The second toothed pulley is rotatably coupled to the second pulley support about a second pulley axis. The third toothed pulley is rotatably coupled to the second pulley support about a third pulley axis.

A bicycle derailleur mechanism is provided which accommodates larger radial spacing and/or smaller radial spacing having a non-uniform value over the respective winding region. The derailleur mechanism cable pull transmission device may provide over its rotational angular range about the rotational axis, which is effective during operation, a variable transmission ratio as a function of the rotational position of the cable pull transmission device relative to the base component.

A bicycle derailleur mechanism is provided which accommodates larger radial spacing and/or smaller radial spacing having a non-uniform value over the respective winding region. The derailleur mechanism cable pull transmission device may provide over its rotational angular range about the rotational axis, which is effective during operation, a variable transmission ratio as a function of the rotational position of the cable pull transmission device relative to the base component.

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.

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.

A sequential adjacent drive assembly for a single pivot rear suspension cycle includes a cycle frame and a suspension assembly operably attached to the cycle frame. The suspension assembly includes a wheel carrier and a wheel carrier fixed pivot. A primary drive assembly includes a primary drive sprocket having a primary drive sprocket rotation axis, a primary driven sprocket, and a primary drive chain operably connecting the primary drive sprocket and the primary driven sprocket. A secondary drive assembly is operably connected to the primary drive assembly. The secondary drive assembly includes a secondary drive sprocket having a secondary drive sprocket rotation axis, a secondary driven sprocket, and a secondary drive chain operably connecting the secondary drive sprocket and the secondary driven sprocket. A wheel is operably attached to the cycle frame and the secondary driven sprocket is operably connected to the wheel.

A sequential adjacent drive assembly for a single pivot rear suspension cycle includes a cycle frame and a suspension assembly operably attached to the cycle frame. The suspension assembly includes a wheel carrier and a wheel carrier fixed pivot. A primary drive assembly includes a primary drive sprocket having a primary drive sprocket rotation axis, a primary driven sprocket, and a primary drive chain operably connecting the primary drive sprocket and the primary driven sprocket. A secondary drive assembly is operably connected to the primary drive assembly. The secondary drive assembly includes a secondary drive sprocket having a secondary drive sprocket rotation axis, a secondary driven sprocket, and a secondary drive chain operably connecting the secondary drive sprocket and the secondary driven sprocket. A wheel is operably attached to the cycle frame and the secondary driven sprocket is operably connected to the wheel.