Patent ID: 8720511

Claim:
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 t 90 >t p10 , t 10 <t s90 and t s90 <t 90 <t p90 are satisfied when characteristic values of vulcanization of the ply coating rubber constituting the ply layer (a) are represented by t p10 and t p90 , 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 t s10 and t s90 and characteristic values of vulcanization of rubber for a sheet constituting the rubber sheet (d) are represented by t 10 and t 90 , [the characteristic values of vulcanization being obtained in accordance with Japanese Industrial Standard K6300-2, t p10 , t s10 and t 10 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 t p90 , t s90 and t 90 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].