Abstract: The arm and leg powered vehicle and head-mounted steering system therefor is a bicycle or similar vehicle, which is powered by the user through rotational actuation of both foot pedals and a hand-actuated crank, both of which provide rotational drive for the vehicle. The steering system for the vehicle includes a helmet-mounted steering mechanism, which translates rotational movement of the user's head and helmet into steering control for the vehicle, allowing the user to steer the vehicle only with the user's head and neck, leaving the user's hands free to power the vehicle. The helmet-mounted steering mechanism can be selectively disengaged, allowing the user to control the vehicle in a conventional manner.