Run flat tire

A run flat tire which comprises

• (a) a ply layer disposed extending toroidally between a pair of bead cores and comprising ply coating rubber and ply cords,
• (b) an inner liner layer disposed circumferentially at an inner side of the ply layer (a),
• (c) a side reinforcing rubber layer having an approximately crescent-shaped cross section and disposed in side portions of the tire between the ply layer (a) and the inner liner layer (b) and
• (d) a rubber sheet disposed so as to extend along an interface of the ply layer (a) and the side reinforcing rubber layer having an approximately crescent-shaped cross section (c),
• wherein relations of t90>tp10, t10<ts90 and ts90<t90<tp90 are satisfied when characteristic values of vulcanization of the ply coating rubber constituting the ply layer (a) are represented by tp10 and tp90, characteristic values of vulcanization of a side reinforcing rubber constituting the side reinforcing rubber layer having an approximately crescent-shaped cross section (c) are represented by ts10 and ts90 and characteristic values of vulcanization of rubber for a sheet constituting the rubber sheet (d) are represented by t10 and t90,
• [the characteristic values of vulcanization being obtained in accordance with Japanese Industrial Standard K6300-2, tp10, ts10 and t10 each representing a time for 10% vulcanization (an induction time) of the ply coating rubber, the side reinforcing rubber and the rubber for a sheet, respectively, and tp90, ts90 and t90 each representing a time for 90% vulcanization (an optimum vulcanization time) of the ply coating rubber, the side reinforcing rubber and the rubber for a sheet, respectively].