Run Flat Tire

摘要

A double bead type run flat tire includes a pair of bead sections having annular beads, sidewall sections extending outwardly from the bead sections in a diametrical direction of the tire, reinforcing rubber layers disposed in the sidewall sections, and annular protrusion sections protruding outwardly from at least one bead section in the width direction of the tire including an annular bead. The second moment Iw of area in the width direction and the second moment Iz of area in the diametrical direction in a section of the bead along the tire meridian satisfies the relationship: 49 mm⁴<=IW<=524 MM⁴, 7 mm⁴<=IZ<=29 MM⁴, and 3.9<=Iw/Iz<=18.2. A protruding portion is formed at the inner side of the bead protruding by more than 0.5 mm from the inner peripheral side face in the annular protrusion section in the diametrical direction of the tire.