Patent ID: 6116312
Filing Date: 2000-09-12
Classification: B60C,Y10T

Abstract:
A heavy duty pneumatic radial tire comprising a pair of bead cores, a carcass ply toroidally extending between the bead cores and turned up around each bead core from inside of the tire toward outside thereof to form a turnup portion, and a wire chafer arranged at least along an outer surface of each turnup portion so as to locate an outer end thereof outward from an outer end of the turnup portion in a radial direction of the tire, in which each bead core has a bending rigidity within a range of 0.10.ltoreq.L/D.ltoreq.0.27 wherein L is a vertical displacement at a position when only a half portion of a circumferential length of the bead core is horizontally and fixedly laid on a table and a weight of 50 kg is suspended in a position dividing the remaining half portion of the circumferential length into two equal parts, and D is an inner diameter of the bead core.