Abstract: A self-propelled cycle-type vehicle comprises a drive wheel rotatably supported by the vehicle frame and coupled to the vehicle foot pedals; a planetary wheel of larger diameter than the drive wheel and rotatably supported by the frame around the drive wheel, with the outer face of the drive wheel engageable with and rollable along the inner face of the planetary wheel, the outer face of the planetary wheel being rollable along the surface over which the vehicle is propelled; and a balancing wheel also rotatably supported by the frame and having an outer face rollable along the surface over which the vehicle is propelled.Two embodiments of the invention are described for propelling the vehicle along the ground, and a third embodiment is described for propelling the vehicle along railroad tracks.