| 摘要 |
PURPOSE:To reduce heterogeneous rigidity distributed among block elements and thereby prevent unvulcanized rubber from heterogeneously drifting by subjecting a surface of the block element to specific siping. CONSTITUTION:Three lines of blocks are disposed on a central portion of a tread part T, and three kinds of block elements A, B, and C each having a different pitch are periodically arranged on each line of the blocks circumferentially of a tire. siping a, b, and c are subjected to surfaces of the block elements A, B, and C. Widths of these siping a, b, and c are set to be respectively aw> bw>cw. A ratio of the widths of the siping is set to be substantially equal to a ratio between the pitches of the block elements to each of which blocks each siping belongs. |
