| 摘要 |
A pneumatic tire having a toroidal carcass. The tire satisfies the following expressions (1) to (4): Ra/D<=08 (1); Rb/D<=08 (2); 0<phia<=50° (3); and 0<phib<=50° (4), where, in a tire meridional section in a standard state in which the 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 the first point A, the first point A being a point where a tire radial direction line Y passing through a wheel rim width position of the standard wheel rim intersects the tire center line passing through a midpoint of a thickness of the tire on a tread portion side and a second point B being a point where the tire radial direction line Y intersects the tire center line on a bead portion side, Rb is a radius of curvature of a second arc having a center Ob on the tire axial direction line X and on the tire inner cavity side and in contact with the tire center line at the second point B, phia is an angle formed by the tire axial direction line X and a straight line Oa-A connecting the center Oa and the first point A, phib is an angle formed by the tire axial direction line X and a straight line Ob-B connecting the center Ob and the second point B, and D is an outer diameter of the tire.
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