| 摘要 |
PROBLEM TO BE SOLVED: To increase a noise performance with a pattern symmetric with respect to a line while maintaining some advantages of the pattern symmetric with respect to a line and without obstructing a steering stability and riding comfortableness. SOLUTION: A tread part 2 is divided into two parts: a center rib area 4 extending substantially continuously between circumferential grooves 3 and 3 and outside areas 5L and 5R on the outer side of the center rib area. The center rib area 4 is provided with a pattern PC symmetric with respect to a line comprising a plurality of pattern elements symmetric with respect to a line. Each of the outside areas 5L and 5R is provided with same arrangement patterns PL and PR obtained by arranging the plurality of pattern elements 7 circumferentially in the same manner. In addition, a length S equal to 0.15 to 0.25 times a average circumferential length of each of the pattern elements 7 is shifted circumferentially between these two same arrangement patterns PL and PR. |
