| 摘要 |
PURPOSE:To prevent a partial abrasion generated at the shoulder and the like effectively by specifying the width between the main grooves which are apart from the tread center area, and the angles of cuttings and small grooves inclining between the main grooves to the tire diameter direction respectively. CONSTITUTION:On the tread surface, three main grooves are arranged in the direction of the tread periphery placing the same intervals, and between the main grooves, cuttings and small grooves inclinging in the peripheral direction are furnished. In this case, the width between the main grooves apart from the tread center area, or the center of the peripheral direction, is set 30 to 65 % the width of the thread. And between the main grooves, as well as cuttings and small grooves with the angle 10 deg. to 60 deg. to the direction of the tire diamener are arranged at all the periphery an the angle inverse to the tire center with the same intervals, a focusing area consisting of two sides extending to the tire tread end opposite to the peripheral direction is arranged. Moreover, the cuttings and the small grooves are contacted to the tread surface gradually from the focusing area of the tire center to the end of each tread. |
