Patent ID: 7900668

Claim:
A pneumatic tire comprising a tread portion in which a central main groove extending in a circumferential direction of the tire is located in an equator of the tire or in the vicinity thereof, and a side main groove extending in the circumferential direction of the tire is located between the central main groove and a tread end, and gently slant grooves each inclining at a relatively large angle with respect to the circumferential direction of the tire are extended from the tread end toward the equator of the tire, and said gently slant grooves comprise first and second gently slant grooves having two different inclination angles and these first and second gently slant grooves are alternately arranged at predetermined intervals in the circumferential direction of the tire and the inclination angle of the first gently slant groove is made larger than that of the second gently slant groove, wherein the first and second gently slant grooves are terminated in a central land portion located between the central main groove and the side main groove, respectively, and first and second fine grooves are further arranged so as to extend from terminal ends of the first and second gently slant grooves toward the central main groove and open thereto, respectively, wherein a plurality of central blocks constituting a central land portion defined by two first gently slant grooves adjacent to each other in the circumferential direction of the tire are constituted with a first segment block of substantially a triangular form defined by the first and second gently slant grooves and the first and second fine grooves, a second segment block defined by the central main groove, a steeply slant groove and the first and second fine grooves, and a third segment block defined by the side main groove, the steeply slant groove and the first and second gently slant grooves.