| 摘要 |
PROBLEM TO BE SOLVED: To effectively suppress particle wear in a shoulder rib part, while improving in good balance both traction performance and wandering resistant performance. SOLUTION: In an outer side of a tread surface 2S provided with a zigzag vertical main groove Go, a wandering preventing notched slope 9 is provided, and a lug groove Y is formed in a shoulder rib part Ro between a tread edge TE and the vertical main groove Go. In the notched slope 9, an angle relating to a normal in the tread edge TE is 40 to 50 degree and larger than an angle relating to a normal in an inner end position P1 of a groove bottom Ys of the lug groove Y. The height of the notched slope 9 is set to 50 to 67% groove depth of the vertical groove Go. A distance LA from the inner end position P1 to the vertical main groove Go is set to 0.95 to 1.15 times a shoulder rib minimum width LB from the tread edge TE to the vertical main groove Go. A distance LD in a surface in parallel to the tread surface 2S from an outer edge 9e of the notched slope 9 to the groove bottom Ys is formed larger than a distance LC in the tread surface 2S from the tread edge TE to the inner end position P1. |
