Heavy duty pneumatic radial tire with stress mitigating rib

摘要

A heavy duty pneumatic radial tire is disclosed. This tire has a tread pattern formed in a tread divided into zigzag circumferential ribs by at least two zigzag main grooves. The tread includes a stress-mitigating rib arranged at least near the top of the convex part of the circumferential rib and parallel to the edge line of the circumferential rib through substantially an isolation groove.