Patent ID: 6457503
Filing Date: 2002-10-01
Classification: B60C

Abstract:
A pneumatic tire comprising a carcass extending from a tread portion through sidewall portions to bead cores in bead portions and satisfying the following expressions:Ra/D&lE;0.08; Rb/D&lE;0.08; 0&lE;50Â°; and 0&lE;50Â°, where, in a tire meridional section in a standard state in which said tire is mounted on a standard wheel rim, inflated to a standard inner pressure, and not loaded, Ra is a radius of curvature of a first arc having a center Oa on a tire axial direction line X passing through a midpoint between a first point A and a second point B and on a tire inner cavity side and in contact with a tire center line at said first point A, said first point A being a point where a tire radial direction line Y passing through a wheel rim width position of said standard wheel rim intersects said tire center line passing through a midpoint of a thickness of said tire on a tread portion side and a second point B being a point where said tire radial direction line Y intersects said tire center line on a bead portion side,Rb is a radius of curvature of a second arc having a center Ob on said tire axial direction line X and on said tire inner cavity side and in contact with said tire center line at said second point B, &phgr;a is an angle formed by said tire axial direction line X and a straight line Oa-A connecting said center Oa and said first point A, &phgr;b is an angle formed by said tire axial direction line X and a straight line Ob-B connecting said center Ob and said second point B, and D is an outer diameter of said tire in said standard state.