HEAVY DUTY PNEUMATIC TIRE

摘要

A heavy duty pneumatic tire includes a tread portion provided with at least one circumferentially extending main groove, at least one circumferentially extending sub groove, and a plurality of lateral grooves to form repeated pitch elements each of which consists of one lateral groove and a block element. The sub groove includes a shallow bottom part with a depth smaller than that of the main groove. The shallow bottom part of the sub groove is provided with a groove bottom sipe. The lateral grooves include a shallow bottom part with a depth smaller than that of the main groove. The shallow bottom part of the lateral groove is provided with a groove bottom sipe. The lateral grooves have groove widths W2 in a range of from 5% to 15% in relation to a circumferential length L1 of the pitch element.

主权项

1. A heavy duty pneumatic tire comprising
a tread portion provided with at least one circumferentially and continuously extending main groove, at least one circumferentially and continuously extending sub groove, and a plurality of lateral grooves to form circumferentially repeated pitch elements each of which consists of one lateral groove and a block element divided between two adjacent lateral grooves, the sub groove comprising a shallow bottom part having a depth smaller than that of the main groove, the shallow bottom part of the sub groove provided with a groove bottom sipe extending along the sub groove, and the lateral grooves comprising a shallow bottom part having a depth smaller than that of the main groove, the shallow bottom part of the lateral groove provided with a groove bottom sipe extending along the lateral groove, the lateral grooves having groove widths W2 in a range of from 5% to 15% in relation to a circumferential length L1 of the pitch element.