Patent ID: 6123131
Filing Date: 2000-09-26
Classification: B60C

Abstract:
A heavy duty radial tire comprisinga tread portion with a pair of tread edges, the tread portion provided with main grooves having a depth,a pair of sidewall portions in which a maximum tire width point exists,a pair of bead portions defining a bead base line,a portion from the tread edge to the maximum tire width point provided with a profile which is formed by adding at least a protrusion to a basic profile,said basic profile consisting of an upper line and a lower line,the upper line extending radially inwardly from the tread edge and curved concavely so as to have a center of curvature outside the tire,the lower line extending radially outwardly from the maximum tire width point and curved convexly so as to have a center of curvature inside the tire,the upper line and lower line intersecting each other so as to form an inflection point,the radial height of the inflection point from the bead base line being in the range of from 0.82 to 0.88 times a groove bottom line height,the groove bottom line height being the radial height between the bead base line and a groove bottom line drawn parallel with the tread surface at said depth of the main grooves measured at axial ends of the groove bottom line,said protrusion having an apex positioned such that the axial distance measured axially outwardly from the inflection point to the apex is in the range of from 4 to 8 mm, andthe radial distance measured between the inflection point and the apex is in the range of from 0 to 5 mm.