| 摘要 |
PURPOSE:To improve tractive ability on weakroad surfaces while tire noise is reduced, and thereby enhance steering stability and durability of the tire. CONSTITUTION:A lateral groove 3 whose one end is opened on a tread face (e) is provided on a tread on a tread face 2, and two or more platforms P of triangular cross-section are formed on each side wall 4 of the lateral groove 3. Each platform P has a step face H projecting from the side wall 4, and a fall-down face J extending from the inner edge He up to the side wall 4, and the lateral length LP of the step face H is taken as 0.5-1.0 times the lateral length LG of the lateral groove 3. Furthermore, the height (e) of the platform of the fall-down face J is taken as 0.1-0.3 times the groove depth D of the lateral groove 3, and the projecting distance W of the step face H from the side wall 4 is taken as 0.2-0.4 times the groove width TW at the height of the step face H. |
