Patent ID: 6112788
Filing Date: 2000-09-05
Classification: B60C

Abstract:
A pneumatic tire comprisinga tread portion having a tread surface and provided with a plurality of longitudinal grooves, each longitudinal groove extending continuously in the circumferential direction of the tire and having a bottom and a pair of sidewalls defining corners therebetween,each of said corners being rounded with a circular arc having a radius of not more than 2 mm,inclination angles of said sidewalls being in the range of not more than 15 degrees with respect to the normal direction to the tread surface,said bottom provided with a plurality of ribs extending in the longitudinal direction of the groove and being substantially parallel with each other so that the bottom has a wavy configuration having no angled corner, when viewed from a cross sectional perspective, and outermost valleys between the sidewalls and ribs and intermediate valleys between the ribs are defined, andthe heights of the ribs measured from the deepest point of the longitudinal groove being in the range of from 0.5 to 1.0 mm,wherein the intermediate valleys are deeper than the outermost valleys.