| 摘要 |
PROBLEM TO BE SOLVED: To provide a run flat tire capable of outstandingly enhancing durability in run flat traveling without impairing riding comfort in usual traveling and improving tire uniformity. SOLUTION: The run flat tire is provided with a side reinforcement rubber layer in which a meridian cross section is a crescent shape over the whole area or the approximately whole area of both side parts along an inner surface of a carcass ply. The carcass ply cord includes at least 50 mass% or more of polyketone fiber and has the maximum thermal contraction stress of 0.1-0.9 cN/dtex as the dipped cord. The thermal contraction ratio at 150°C×30 min. dry heat treatment of the polyketone fiber is within a range of 3.0-6.5%, the carcass ply includes a weft yarn crossing to a cord arranged in an approximately radial direction, and the weft yarn is cut at a plurality of positions in a tire circumferential direction with an approximately constant interval. COPYRIGHT: (C)2009,JPO&INPIT
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