RUN-FLAT TIRE

A run-flat tire ensures run-flat durability with a reduced weight. A tire radial outermost carcass ply of two or more carcass plies has tire widthwise inner ends in a crown portion. A bead filler and side reinforcing rubber have an overlapping part in the tire width direction. In a cross section of the run-flat tire in the tire width direction in a state where the run-flat tire is attached to an applicable rim, filled to a specified internal pressure, and placed under no load, a thickness d1 of a sidewall portion at a midpoint in the tire radial direction between a maximum width position of the run-flat tire and a tire radial outermost position of a bead core is greater than a thickness d2 of the sidewall portion at a midpoint in the tire radial direction between the maximum width position of the run-flat tire and a tread edge.