PROBLEM TO BE SOLVED: To solve the problem that since a wheelchair has its center of gravity of a sitting person located at the center of wheels, stability is lost and a two-dimensional movement force in a one-dimensional friction area at the time of starting movement is easily changed into a force to move forward, that an inertial force (a magnification of 3.14 times: the law of a universal vise) grows into an actual power, and that when one of the two wheels of the wheelchair is removed, it becomes a unicycle which is really difficult to ride.;SOLUTION: When five speed-change gears are attached to both the front and the rear, ten speed-change gears in total, of the self-travelling vehicle, and the self-travelling vehicle is designed for the use for competition, it has more efficiency of the transmission of a force than a bicycle, and it can travel at a speed of up to 130km an hour. The self-travelling vehicle does not take up much room in a parking lot for bicycles, and can be promptly stored in a trunk of a car. Then the self-travelling vehicle can become a bicycle, and one can easily ride the unicycle without any difficulty when riding the self-travelling vehicle.;COPYRIGHT: (C)2007,JPO&INPIT
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