Abstract: An electrically assisted pedal cycle including a frame rotatably mounting a ground engaging wheel. A pedal shaft is supported by the frame with its axis extending transverse to the plane of the frame, the shaft being supported for rotational movement and limited axial movement relative to the frame. A coupling is provided whereby rotation of the shaft relative to the frame at least in one direction can be transmitted to the ground engaging wheel to propel the cycle. A screw arrangement is incorporated whereby rotation of the shaft in the one axial direction moves the shaft axially relative to the frame in one axial direction. An electrical switch is operated by such axial movement of the shaft relative to the frame and the electrical switch is associated with an electric motor and associated power source which are carried by the frame to prevent energization of the electric motor until the electrical switch is operated by the axial movement of the shaft.