Patent ID: 6167932
Filing Date: 2001-01-02
Classification: B60C,Y10T

Abstract:
A pneumatic tire for passenger cars comprising a tread portion, wherein when the tire is mounted on a regular rim and inflated to 200 kPa and loaded with no tire load, said tread portion is provided with a profile comprising a crown part having a radius of curvature R1 in mm and shoulder parts each having a radius of curvature R2 in mm, said crown part defined as extending from the tire equator to an axial position on each side thereof spaced at an axial distance of 35% of a tread width from the tire equator, each said shoulder part defined as extending on one side of the tire equator from an axial position spaced at an axial distance of 37.5% of the tread width from the tire equator to an axial position spaced at an axial distance of 45% of the tread width from the tire equator, the tire characterized in that a harshness factor HF is set in the range of from 3.2 to 3.5, said the harshness factor HF defined as HF=-0.133.times.(R1/100)+0.245.times.(R1/R2)-0.183.times.(Kv/10)+3.898 wherein Kv is the vertical spring constant in kN/mm of the tire.