| 摘要 |
PROBLEM TO BE SOLVED: To prevent the wettability and traction property from being rapidly degraded even when a tread rubber is worn to some degree, and to suppress any block come-off at a center part in the tire width direction and the heel- and-toe biased wear at a shoulder block. SOLUTION: The shape of a first raised part 5a provided on a groove bottom 3a is substantially semi-cylindrical, the maximum height (h) thereof is 0.2-0.5 time the maximum groove depth H of a sub groove 3. The shape of a second raised part 5b provided on a groove bottom 3b is a small block 8 mounted on a large block 7, the arrangement width (a) of the small block 8 is 0.2-0.5 time the shoulder block width W on a tread edge part 7a of the large block 7, and the height (b) of the small block 8 is 0.2-1.0 time the height L of the large block 7. |
