Patent ID: 7152641

Claim:
A heavy-duty pneumatic tire, whose shoulder portion is divided into a plurality of shoulder blocks in the tire circumferential direction, and in which the depth of lug grooves disposed between the shoulder blocks is set in a range of 90% to 110% of the depth of a main groove thereof the pneumatic tire comprising: a non-contact rib which does not come into contact with the ground outside a ground contact width, the non-contact rib being provided, in a serial configuration in the tire circumferential direction, to a buttress portion outside the ground contact width, so as to come into contact with the side faces of the shoulder blocks in a state that the tire is in contact with the ground with a specified inflation pressure and a specified load, and a narrow groove disposed between the shoulder blocks and the non-contact rib, wherein the side faces of the shoulder blocks extend linearly from a ground contacting surface of the shoulder blocks to a bottom of the narrow groove in a cross-section of the tire.