| 摘要 |
PROBLEM TO BE SOLVED: To inhibit the block chanking while properly keeping the griping property on a rough road. SOLUTION: A center block Bc has an internal angle groove part 5 where internal angle wall faces 6, 6 are joined at a tip part of a projecting part 4 projecting in the tire circumferential direction. A meeting line K between the internal angle wall faces 6, 6 has an upper inclined part KU extended while inclined to a normal N at an angle ofθ1 on a cross section including the normal N on a tread face 2, and a lower inclined part KL connected to the upper inclined part KU through a folding point P1 and extended in the normal direction. A depth D1 of the folding point P1 from the tread face 2 is 0.30-0.50 times of a groove depth H of the tread groove 3. |
