A rear derailleur assembly for mounting to a bicycle, wherein the bicycle includes a frame and a cable for actuating the rear derailleur assembly, comprising: an upper body for operationally engaging the rear derailleur assembly to the frame; a cable stay operationally engaging the upper body at a first end and extending away therefrom, wherein the cable stay includes a bore therethrough located at a second end generally opposite the first end; a chain cage for engaging a chain of the bicycle; a controller comprising spaced-apart upper and lower link arms (76, 74), the upper link arm being pivotally connected at one end to the upper body, and the lower link arm being pivotally connected at one end to the upper body; a lower body operationally connected to the chain cage, the upper link arm being pivotally connected to the lower body at an end opposite the end pivotally connected to the upper body, and the lower link arm being pivotally connected to the lower body at an end opposite the end pivotally connected to the upper body, a spring operationally engaging the controller, and biasing the upper and lower link arms (74, 76) in a first direction; characterized in that the upper link arm includes an actuating arm located on an outward facing rear portion of the upper link arm, the cable for actuating the derailleur assembly passes through the bore in the cable stay to operationally engage an end of the actuating arm, whereby tension on the cable causes relative movement between the upper body and the lower body, moves the upper and lower link arms (74, 76) in a second direction opposite the first direction, and moves the chain cage laterally towards the frame, wherein the second end of the cable stay is generally aligned with the end of the actuating arm when the cable stay is in an operational configuration. an upper body for operationally engaging the rear derailleur assembly to the frame; a cable stay operationally engaging the upper body at a first end and extending away therefrom, wherein the cable stay includes a bore therethrough located at a second end generally opposite the first end; a chain cage for engaging a chain of the bicycle; a controller comprising spaced-apart upper and lower link arms (76, 74), the upper link arm being pivotally connected at one end to the upper body, and the lower link arm being pivotally connected at one end to the upper body; a lower body operationally connected to the chain cage, the upper link arm being pivotally connected to the lower body at an end opposite the end pivotally connected to the upper body, and the lower link arm being pivotally connected to the lower body at an end opposite the end pivotally connected to the upper body, a spring operationally engaging the controller, and biasing the upper and lower link arms (74, 76) in a first direction; characterized in that the upper link arm includes an actuating arm located on an outward facing rear portion of the upper link arm, the cable for actuating the derailleur assembly passes through the bore in the cable stay to operationally engage an end of the actuating arm, whereby tension on the cable causes relative movement between the upper body and the lower body, moves the upper and lower link arms (74, 76) in a second direction opposite the first direction, and moves the chain cage laterally towards the frame, wherein the second end of the cable stay is generally aligned with the end of the actuating arm when the cable stay is in an operational configuration.