Patent ID: 7493929

Claim:
A pneumatic tire and rim assembly comprising: a pneumatic tire and a rim; the pneumatic tire comprising: a tread portion, a pair of sidewall portions, a pair of bead portions each having a bead core therein, a carcass comprising at least one ply of cords, wherein in a meridian section of the tire under a non-mounted state that the tire is not mounted on the rim but the bead portions are held such that the bead width is equal to the rim width of the rim: said each bead portion has a profile comprising: a bead toe, a heel-side point being a point on the bead surface near the heel and having a diameter in a range of from 99.1 to 99.3% of a rim-diameter of the rim, and a bead base extending between the bead toe and the heel-side point; the bead base comprising: a base width between the bead toe and the heel-side point in the tire axial direction, a straight part extending on a straight line passing through both of the bead toe and the heel-side point having an inclination of more than 0 to 15 degrees with respect to the axial direction of the tire, a convex part provided between an axially outer end of the straight part and the heel-side point and protruding radially inside of the straight line, and the convex part having a radius of curvature of from 0.20 to 0.33 times the base width and a protruding height from the extended line of from 0.067 to 0.13 times the base width, wherein the convex part has a radius of curvature of from 3.0 to 5.0 mm, and a width of the convex part in the tire axial direction is in a range of from 0.20 to 0.25 times the base width.