| 摘要 |
PURPOSE:To embody low noise without the lowering of performance such as traction performance and wear resistance by specifying the shape and pitch arrangement of lug grooves at the left and right side parts of the tread. CONSTITUTION:Lug grooves 6 and lugs 7 are alternately disposed at the tread left side and right side with the equator l placed in between in the tread (m) of a tire. The fluctuation quantity by one round part of the tire is generated to the actual grounding length of a tire grounding front edge part under JIS standard air pressure and standard dual wheel load. This fluctuation quantity is the difference between the maximum value and minimum value by one round part of the tire. The lug grooves 6 and lugs 7 are therefore disposed in such a way that this fluctuation quantity is 0.25 or less in relation to the total grounding length of the tire grounding front edge part, under the same air pressure and load, of the same tire but smooth without lug grooves. Low noise can be thereby attained without having an adverse effect to the performance of the tire such as traction performance and wear resistance. |
