Patent ID: 6530410
Filing Date: 2003-03-11
Classification: B60C,D07B,Y10S,Y10T

Abstract:
A pneumatic radial tire, comprising;a pair of bead portions, and a carcass as a skeletal component of the tire, constituted of a ply of radially disposed cords and extending in a toroidal form between the pair of bead portions, wherein the carcass including circumferentied steel cords, each steel cord having at least one steel filament, with a tensile rigidity, EL, the EL satisfying an equation (1) as follows: 1300&lE;EL(kgf/mm2)&lE;2400 EL=ECÃ—FA/(DÃ—S)â€ƒâ€ƒ(1) whereinEC is the Young's modulus of the steel cord (kgf/mm2); FA is the total sectional area of the filament forming the steel cord (mm2); D is the diameter of the steel cord (mm); and S is the pitch between the steel cords that are adjacent in a crown portion (mm).