Tire for heavy load that prevents center wear and river wear

摘要

A tire for heavy load with a aspect ratio of 80% or less has five ribs which are a center rib extending on a tire equator, a pair of outer ribs extending along a tread edge and a pair of intermediate ribs each extending between the center rib and the outer ribs. An outer end line of the intermediate rib extends in the circumferential direction in zigzags. In a state of 5% internal pressure, a distance (X) from the tire equator line to a center line (Q) of the zigzagged outer end line is in a range of 0.25 to 0.275 times the tread width (WT). A tread radius of curvature R under the state of 5% internal pressure and a difference (Y=y2-y1) satisfy the following equation (1): -0.001R+0.4 mm