| 摘要 |
PURPOSE: A tire is provided to ensure stability since a round groove is formed on a tire and road makes contact with both ground contact wheels of the round groove. CONSTITUTION: A tire(1) comprises a round groove(3) and ground contact wheels(4). The round groove is formed along the central line of a tread. The ground contact wheels are installed on both sides of the round groove. Both walls of the round groove form a curved surface or a tapered surface, which gets narrow by the round groove. The tire moves its centroid to one of both ground contact wheels. The tire enables one ground contact wheel to curve-drive away from road. The round groove is formed so that the sand from the road is guided to the inside by the tapered surface.
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