| 摘要 |
<P>PROBLEM TO BE SOLVED: To improve mud performance, while restraining reduction in noise performance and steering stability. <P>SOLUTION: A tread part 2 is divided into a plurality of blocks 5 by a zigzag peripheral directional groove 3 and a peripheral groove 4. The zigzag peripheral directional groove 3 forms a rectangular waveform of connecting a part between the innermost longitudinal groove part 6 and the outermost longitudinal groove part 7 in the tire axial direction. Zigzag amplitude K of the zigzag peripheral directional groove 3 falls within a range of 4-15% of a tread half width (TW/2), and a groove width WG falls within a range of 7-13% of the tread half width (TW/2). The number (n) of the total of the peripheral groove 4 crossing on its both sides is 8-12 pieces in a grounding surface F to one zigzag peripheral directional groove 3, and a groove width WY of the peripheral groove 4 is 8-25% of the pitch length Py between the peripheral grooves 4 and 4. <P>COPYRIGHT: (C)2012,JPO&INPIT |
