| 摘要 |
PURPOSE:To make improvements in grip performance and controllability in time of traveling on ice and snow as well as to keep the stability of traveling on a dried road surface. CONSTITUTION:A radius of curvature TR of a tread surface 2 is made to be 0.9 to 1.10 times over the sectional width WT of a tire, and further the ratio of an area SS of a ground contact surface to an area SL of a land face 4 within this ground contact surface (SL/SS) is set to 0.55 to 0.75, and the ratio of the groove depth Gh of an outer longitudinal groove 9 at an outer area 6 to the groove depth GH of an inner longitudinal groove installed in an inner area (Gh/GH) is set to 0.45 to 0.65 respectively. |
