Patent ID: 8162015

Claim:
A pneumatic tire having an asymmetrical tread pattern with respect to both sides of a tire equator line, and designed to be mounted on a vehicle in a way that a designated outer side of the tire faces to an outside of the vehicle, the tire also having a designated inner side provided opposite the outer side, the pneumatic tire characterized in that: at least four main grooves extending in a tire circumferential direction are provided in a tread portion, a plurality of land portions are defined by these main grooves, a plurality of first inclined grooves inclined to the tire circumferential direction are provided in a central land portion positioned on the tire equator line, a plurality of second inclined grooves inclined in a same direction as that of the first inclined grooves are provided in an inner side-intermediate land portion positioned on an inner side of the tire relative to the central land portion, a plurality of lug grooves extending in the tire width direction are provided in an outer side-shoulder land portion on the outer side of the tire, and these lug grooves communicate with one of said main grooves adjacent to the outer side-shoulder land portion; each of the first inclined grooves is opened at one end to the main groove positioned between the central land portion and the inner side-intermediate land portion, and is terminated at the other end in the central land portion, each of the second inclined grooves is opened at one end to the main groove positioned between the central land portion and the inner side-intermediate land portion, and is terminated at the other end in the inner side-intermediate land portion, a plurality of sipes are formed in the central land portion and in the inner side-intermediate land portion, respectively, and the inclined grooves and sipes, which communicate only with the main groove positioned between the central land portion and the inner side-intermediate land portion, are alternately disposed in the tire circumferential direction.