| 摘要 |
PURPOSE:To secure excellent rigidity and the like by specifying respectively block land angles created by a narrow straight groove and lug grooves and the respective dimensional relationships of the straight groove and a tie-bar arranged in this and the like in a tire tread. CONSTITUTION:In a tire tread, and respective land angles (alpha1 and alpha2) created by a single narrow straight groove 3 extending in a circumferential direction and plural lug grooves 5 extending in a width direction, are set respectively within a range of 0 deg.-70 deg.. On the other hand, assuming that length of a tie-bar 10 arranged in the straight groove 3 is L1, and similarly, the depth is D1, and depth of the straight groove 3 is D2, and depth of a wide straight groove 2 having a wear indicator is D, and directional component length of a sub straight groove 3 is A, the following respective relationships are satisfied. That is, L1>=0.7.A. 0.1.D<=D1<=0.5D. D-1.6mm<=D<=(D-1.6mm)X0.5. D1<D2. |
