| 摘要 |
A pneumatic tire, wherein a first main see-through groove is formed on a tre ad surface for which the rotating direction of the tire is specified in one direction in the area of 4 to 15% of a tire ground-contact width on each of the right and left sides of a tire equatorial plane. Lug grooves extending from both first main see-through grooves to the outside of the tire while tilting to the anti-rotating direction of the tire and communicating with th e ground-contact end of the tire are arranged at specified intervals in the circumferential direction of the tire to form blocks of the lug grooves and the first main see-through grooves. V-shaped crossing grooves having crest points on the tire anti-rotating direction side are arranged between the fir st main see-through grooves at specified intervals in the circumferential direction of the tire to form blocks of the crossing grooves and the first main see-through grooves. The width (W) of the crossing grooves is 0.1 to 0.25L where the length of each of the blocks in the circumferential directio n of the tire is L. The ratio ACA/GCA of all ground-contact area of block ACA to the ground-contact area of the overall tread surface GCA comes in the range of 55 to 75%.
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