RUN-FLAT RADIAL TIRE

A run-flat radial tire (10) includes: a carcass (14) spanning between a pair of bead portions (12); an inclined belt layer (16) that is provided at a tire radial direction outer side of the carcass (14) and that is configured by one or more belt plys; a tread portion (20) that is provided at a tire radial direction outer side of the inclined belt layer (16) and that is formed with plural circumferential direction grooves (21); and side reinforcing rubber (24) that is provided at tire side portions (22), that extends along an inner face (14A) of the carcass (14) from a side of the bead portion (12) to a side of the tread portion (20) and overlaps a maximum width belt ply (16A), that has an overlap width (P) along a tire width direction with the maximum width belt ply (16A) with a length of 20% or more of a section height (SH), and that has an upper end portion (24B) at the tread portion (20) side that is positioned further toward a tire width direction outer side than a groove bottom (21AB) of a circumferential direction groove (21A) that is furthest toward the tire width direction outer side.