Patent ID: 6079463
Filing Date: 2000-06-27
Classification: B60C,Y10T

Abstract:
A pneumatic radial tire comprisinga tread portion with a tread,a pair of sidewall portions,a pair of bead portions,a carcass extending between the bead portions,a breaker-belt disposed radially outside the carcass in the tread portion,a band-belt disposed radially outside the breaker-belt and having organic fiber cords laid in substantially parallel with the tire equator,in the meridian section of the tire which is mounted on a standard rim and inflated to 0.5% of a standard inner pressure, the tread has a triple radius profile andthe band-belt having a variable ply number accommodated to the triple radii of the tread such that the number of plies throughout more than 60% of the axial width of the parts of the tread having the first, second and third radii of curvature, respectively, are different from each other.