Abstract: A torque-multiplying kinematic device for use on a traditional rear wheel chain driven bicycle includes a pair of rods, each rod consisting of a foremost portion inclined from a rearmost portion, a pair of pivot connectors and a pair of guiding supports. Each of the rods is connected at the elbow formed by the two portions to a pedal mount on the bicycle cranks by a pivot connector. The foremost portion of each rod is holded in the end opposite the elbow to mount a bicycle pedal while the rearmost portion extends rearward to connect in a reciprocating sliding relationship with a corresponding guiding support mounted on the back fork of the bicycle, the guiding supports rotatable co-axially with the rotational axis of the wheel held between the arms of the back forth.