Run flat tire

A run flat tire, having a tread portion, a pair of sidewall portions continuous with respective sides of the tread portion, bead portions continuous with the respective sidewall portions, and a side-reinforcing rubber having a crescent-shaped cross section and provided in each sidewall portion, wherein in a cross section in the tire width direction thereof:

• provided that an intersection of a straight line tangent to an outer contour line of a bead heal of a bead portion at an end on the bead base surface side of the outer contour line and a straight line tangent to the outer contour line of the bead heal at an end on the bead back surface side of the outer contour line represents “bead heal point” in a case where the outer contour line of the bead heal of the bead portion is constituted of a curved line, and provided that an intersection of an outer contour line, on the bead base surface side, of the bead heal and an outer contour line, on the bead back surface side, of the bead heal represents “bead heal point” in a case where the outer contour line of the bead heal of the bead portion is constituted of straight lines (the bead heal point coincides with the sharp corner point of the bead heal in this case), diameter of a circle collectively formed by the bead heal point is smaller by 1.7-2.9 mm than the rim diameter of the prescribed rim;
• and
• provided that an intersection of an imaginary linear extension of a bead base surface from an end on the bead base surface side of an outer contour line of a bead toe of the bead portion and an imaginary linear extension of a bead inner surface from an end on the bead inner surface side of the outer contour line of the bead toe represents “bead toe point” in a case where the outer contour line of the bead toe of the bead portion is constituted of a curved line, and provided that an intersection of an outer contour line, on the bead base surface side, of the bead toe and an outer contour line, on the bead inner surface side, of the bead toe represents “bead toe point” in a case where the outer contour line of the bead toe of the bead portion is constituted of straight lines (the bead toe point coincides with the sharp corner point of the bead toe in this case), a line linking the bead heal point and the bead toe point is inclined by an angle of 12.2°-14.7° with respect to the tire width direction.