| 摘要 |
PURPOSE:To prevent any uneven wear occurring at a land part near the shoulder edge on the external side of tire fitting by forming a pair of peripheral grooves which extend in the peripheral direction so as to divide the land part into two from the main groove of a tire road surface to the land part on the shoulder edge side, and providing a stepoff area between the pair of peripheral grooves. CONSTITUTION:A pair of peripheral grooves 10, 11 which extends continuously in the peripheral direction so as to divide the land part 8 into two are formed at the land part 8 between the shoulder edge 5 on the external side of tire fitting and the point P apart from the shoulder edge by 1/3 of the width of a road surface, externally from the main groove 7 of the road surface 6. Moreover, the stepoff area 12 which in independent of the land part 8 and is slant to the external side of tire fitting is formed between the peripheral grooves, and the peripheral groove 10 positioned externally in the axial direction is made narrow. This makes the external edge of the stepoff area 12 come in slide contact with the road surface to make the stepoff area 12 function as a sacrificial portion of uneven wear and makes the side surfaces 13, 14 of external peripheral grooves 10 come in contact with each other for the lateral force forward the internal side of tire fitting to restrain the bending deformation of the land part. |
