Patent ID: 6386257
Filing Date: 2002-05-14
Classification: B60C,Y10T

Abstract:
A pneumatic radial tire comprising a carcass toroidally extending between at least a pair of bead cores and a belt superimposed on a crown portion of the carcass and comprised of a single slant belt layer containing a plurality of cords or filaments arranged at a given inclination angle with respect to an equatorial plane of the tire and at least one circumferential belt layer laminated on the slant belt layer and containing a plurality of cords arranged substantially in parallel to the equatorial plane, wherein each cord used in the at least one circumferential belt layer is made from vinylon fiber and has a layer twisting structure and a total denier DT of 1000 d-6000 d and a twist constant Nt=TÃ—(0.139Ã—DT/2Ã—1/&rgr;)Â½Ã—10âˆ’3&lE;0.6 wherein T is a twisting number (twist turns/10 cm) and &rgr; is a specific gravity, wherein a coating rubber for the at least one circumferential belt layer has a modulus of elasticity of not less than 200 kgf/mm2.