Patent ID: 6401777
Filing Date: 2002-06-11
Classification: B60C,Y10T

Abstract:
A pneumatic radial ply runflat tire, comprising two beads, a pair of sidewall portions, and at least one carcass ply wrapped around each bead to end in a ply turnup end located axially and radially outward of each bead, the tire being characterized by:at least one sidewall insert in each sidewall portion; a wheel-rim retainer lip protruding axially outward from the top of each bead area; a chipper comprising a circular band of cords circumferentially disposed in each bead area axially inward of the corresponding ply turnup end; the chipper having a radially outermost edge and a radially innermost edge, such that the chipper increases in radial distance from an axis of rotation of the tire as a function of distance from the chipper's radially innermost edge; the chipper's radially innermost edge being at least 1 millimeter and no more than 10 millimeters radially outward of the bead; the chipper's radially outermost edge being radially within the radially outermost extent of an axially outermost one of the at least one ply turnup end; and the chipper's radially outermost edge also being located above a lower part of the tire's wheel-rim retainer lip by a distance D having a magnitude of between 5% and 20% of the section height SH of the tire.