| 摘要 |
PROBLEM TO BE SOLVED: To sufficiently eliminate the generation of crack in a groove bottom of a narrow groove by providing a narrow groove in a shoulder rib, and interrupting this narrow groove at a part corresponding to a position of sector type laminated surface in the tread circumferential direction over a specified length in the tread circumferential direction. SOLUTION: A shoulder rib 3 is partitioned in a tread side end part by a circumferential main groove 2 continuously extended straight in the tread circumferential direction, and the shoulder rib 3 is provided with a narrow groove 4 extended straight in the tread circumferential direction. This narrow groove 4 is interrupted at plural parts in the tread circumferential direction corresponding to the position of sector type laminated surfaces over the length of 2-15 mm in the tread circumferential direction. Consequently, the narrow groove 4 is formed of plural narrow groove parts 4a aligned in the tread circumferential direction with plural interruption positions 5 as a whole. Generation of crack causing the generation of crack of the groove bottom of the narrow groove 4 is prevented. |
