| 摘要 |
PURPOSE:To dissolve a problem of generation of groove wandering while ensuring stability is straight going and drain ability by forming projections on both side walls in plural straight grooves formed linearly on a tread part in the peripheral direction, and specifying the standing up surfaces and phases thereof. CONSTITUTION:At least two straight grooves 7 along peripheral direction are formed parallel to each other, on a tread part 4 of a tire. On both side walls 8 of each straight groove 7 in this case, projections 11 having grounding plane 10 thus with the grounding plane 9 of the tread part 4 are projected by less than a half of a groove width 12 and formed. Also, a standing up surface 13 on a projected side end on the projection part 11 is set up perpendicular to a groove bottom face. Still more, respective projection parts 11 on both side walls 8 are shifted in their phases in relation to peripheral direction. Accordingly as ensuring stability in straight going and drain ability, occurrence of groove wandering (unsteady phenomenon of a vehicle) is dissolved. |
