| 摘要 |
A heavy duty radial tire includes a pair of shoulder portions tapered at an angle alpha of from 40 to 50 degrees, a pair of zigzag main grooves extending circumferentially to form a pair of shoulder ribs, the shoulder ribs provided with lug grooves each having an axially inner end P1 terminated in the rib and an axially outer end opened at the tread edge TE, the bottom Ys of the lug grooves extending from the radially outer surface to the axially outer surface of the shoulder rib while inclining at an angle beta, the height H1 of the tapered shoulder portion being in the range of from 50 to 67% of the depth Hg of the zigzag main grooves, the angle alpha at the tread edge TE being larger than the angle beta at the axially inner end P1, the distance LA between the axially inner end P1 and the zigzag main groove being in the range of from 0.95 to 1.15 times the minimum distance LB between the zigzag main groove and the tread edge TE, and the distance LD from the taper end 9e to the bottom Ys measured in parallel with the tread surface 2S being larger than the distance LC from the tread edge TE to the axially inner end P1. |
