Heavy duty pneumatic tire

Abstract

A heavy duty pneumatic tire, in which uneven tread wear is controlled, has a tread portion provided with a pair of main circumferential grooves so as to divide the tread portion into a pair of shoulder lands between tread edges and the main circumferential grooves and an axially inner land between the main circumferential grooves, each main circumferential groove having a width of from 4 to 12% of the tread width TW, a narrow circumferential groove extending circumferentially of the tire along one of the main circumferential grooves so as to divide the axially inner land into an axially outer narrow land part and an axially inner major land part, the axial width W1 of the narrow land part being in the range of from 0.1 to 0.2 times the axial width W2 of the major land part, the narrow circumferential groove having a width of 0.5 to 2.5 mm and a depth of 50 to 90% of the depth of the main circumferential grooves, the narrow land part comprising circumferentially alternately arranged sunken parts and unsunken parts, the unsunken parts having the same height as the tread surface, and the sunken parts having a height lower than the tread surface but higher than the bottom of the narrow circumferential groove.