<p>A run-flat tire that realizes not only a striking enhancement of durability at run-flat travel without detriment to ride quality at ordinary travel but also an improvement of tire uniformity. There is disclosed a run-flat tire comprising a side reinforcing rubber layer being crescent in its meridional cross section provided in the whole area or an approximately whole area of each of both side portions along the inner face of a carcass ply. The cord of the carcass ply contains a polyketone fiber in a proportion of at least 50 mass%. The cord having undergone dipping treatment exhibits a maximum thermal shrinkage stress of 0.1 to 1.8 cN/dtex. The polyketone fiber upon 150°Cx30 min dry heat treatment exhibits a thermal shrinkage ratio ranging from 0.3 to 6.5%. The carcass ply contains a weft yarn intersecting with the cord arranged in an approximately radial direction. The weft yarn is cut at given intervals at multiple locations in the circumferential direction of the tire.</p>
