Patent ID: 6619354
Filing Date: 2003-09-16
Classification: B60C,Y10T

Abstract:
A pneumatic tire comprising a carcass of one or more rubberized plies of radially arranged cords toroidally extending between a pair of bead cores embedded in respective bead portions and reinforcing a pair of sidewall portions and a tread portion, a belt of two or more steel cord cross layers disposed on an outer periphery of the carcass to reinforce the tread portion, and a run-flat reinforcing rubber layer arranged in at least a part of a zone ranging from a position near to the bead portion through the sidewall portion to a shoulder region of the tread portion, wherein:the belt has end portions at both shoulder regions of the tread portion; at least one cushion rubber layer is provided between an outermost carcass ply and an end portion of the steel cord layer nearest to such a ply; and the at least one cushion rubber layer has a loss tangent lower than a loss tangent (tan &dgr;) of rubber for coating cords of the carcass.