| 主权项 |
1. A pneumatic tire comprising:
a tread surface; six to eight of main grooves continuously extending in a tire circumferential direction in the tread surface; and a plurality of ribs divided by the main grooves, wherein provided in order from an exterior to an interior in a tire width direction there are shoulder ribs, shoulder main grooves, outer mediate ribs, mediate main grooves, inner mediate ribs, center main grooves, and center rib or ribs, the shoulder main grooves being straight grooves, the center main grooves being zigzag grooves, there being one to three of the center rib or ribs, there being two to four of the center main grooves, and the center rib or ribs being arranged between respective pair or pairs of the center main grooves, wherein a first shallow groove continuously extending in the tire circumferential direction in a zigzag manner is formed in the shoulder rib, second shallow grooves that extend in the tire width direction and are arranged at regular intervals in the tire circumferential direction are formed in each of the inner mediate ribs and the center rib or ribs, and a depth of each of the first and second shallow grooves is set to be in a range of 10% to 40% of a depth of the main grooves, wherein a wall of each section resulting from division by the second shallow grooves includes a central wall surface that is located at a center of the section in the tire circumferential direction and extends in the tire width direction from one end thereof on an interior widthwise of the center main groove to an other end thereof on an exterior widthwise of the center main groove, a first wall surface that extends in the tire circumferential direction from the one end of the central wall surface, and a second wall surface that extends in the tire circumferential direction from the other end of the central wall surface, and wherein the first wall surfaces of the inner mediate ribs and the first wall surfaces of the center rib or ribs are mutually opposed across the center main groove. |
