| 摘要 |
PURPOSE:To improve bias abrasion resistance without impairing traction performance by specifying the point height of main grooves formed on a tread surface, and forming auxiliary grooves with specific lengths and widths on ribs divided by main grooves. CONSTITUTION:Multiple main grooves 1 bent in zigzag along the tire peripheral direction and multiple ribs 3 divided by them are provided on a tread surface. Independent multiple auxiliary grooves 2 are arranged on ribs 3 along the tire peripheral direction at a preset interval without penetrating main grooves 1. The lengths 11-13 of auxiliary grooves 2 projected in the tire width direction are set to 15-40% of the widths W1-W3 of ribs 3, their depths d1-d3 are set to 60-100% of the depth Gd of main grooves 1, and their widths t1-t3 are set to 30-70% of the width GW of main grooves 1 respectively. The point height H of main grooves 1 is set to 0-0.5 times the width GW of main grooves 1. |
