Pneumatic safety tire with excellent long-running ability after puncture employing rubber having specifically defined properties for sidewall inserts and tread

Claim 1

A pneumatic safety radial tire with excellent long-running ability after puncture, comprising a pair of annular bead portions, a carcass extending across the two bead portions, an annular tread portion formed on the outer peripheral surface of the carcass, a pair of sidewalls between one of the bead portions and corresponding one of opposite edges of said tread portion, a pair of rubber reinforcing members mounted to said sidewalls for enhancing rigidity thereof so as to give an ability to bear load on the tire independently, and a tread reinforcing belt layer embedded in tread rubber forming said tread portion while surrounding said carcass, said rubber reinforcing members consisting of an elastomer having a JIS hardness of not less than 70, a tensile stress (Mod 25 ) of not less than 10 kg/cm 2 after an aging test for 24 hours in an inactive atmosphere at 140° C.±1° C., and a repulsive elasticity by Dunlop tripsometer of not less than 65%, while said tread rubber consisting of an elastomer having a repulsive elasticity by Dunlop tripsometer of not less than 40% together with regular characteristics.