Patent ID: 7273081

Claim:
A heavy load pneumatic tire in which a tread portion has a rib pattern formed with ribs divided by main grooves which are continuous in a circumferential direction of the tire, wherein at least one of the main grooves that is located on the outermost side in a widthwise direction of the tire is provided at its groove bottom with a projecting stripe which is continuous in the circumferential direction of the tire, and the ribs adjacent to an inner side of the main groove are provided with closed sipeings arranged at substantially constant distances from each other, wherein the projecting stripe is comprised of a high-height portion and a low-height portion arranged alternately and repeatedly along the circumferential direction of the tire, wherein the high-height portions are cyclically disposed at positions where there are no closed sipeings as viewed from the side of the tire, and the low-height portions are cyclically disposed at positions where the closed sipeings are located as viewed from the side of the tire.