Patent ID: 6186205
Filing Date: 2001-02-13
Classification: B29D,B60C,D07B,Y10S

Abstract:
A pneumatic tire for a passenger car, comprising:a pair of bead portions;a toroidal carcass layer extending over both bead portions;at least two belt layers provided in a crown portion of said carcass layer;a tread portion positioned at an outer peripheral side of said at least two belt layers;side wall portions provided at the right and left sides of said tread portion; anda steel cord serving as a reinforcing material for reinforcing at least one layer selected from said carcass layer and said at least two belt layers,wherein said steel cord is formed by plying a plurality of filaments each having a diameter of 0.125 to 0.275 mm, has an inflection point on a stress-strain curve thereof within a range of over 1% of extension rate, and the reduction rate of the diameter of said steel cord, which is a rate of the diameter of the cord under a load stress one third of the tensile stress at breaking to the diameter of the cord under no load stress, is equal to or more than 20%.