Pneumatic safety tire

In a pneumatic safety tire for high speed vehicle driving on a highway, including a pair of annular beads, a carcass extending across the two beads, an annular tread portion formed on the outer peripheral surface of the carcass, a pair of shoulders formed at opposite edges of said tread portion and extending toward each bead, a pair of side walls formed between one of the beads and the corresponding shoulder portion, and an additional reinforcement for each bead extending in the direction of the sidewall, the improvement characterized by:

• a pair of annular elastomeric reinforcements each having at least one elastomer element continuously disposed from the tread portion to the bead portion along the carcass so as to supplement the thickness of said sidewall and thereby enhance the inherent rigidity of the sidewall and its ability to support a load under conditions of reduced tire pressure, each said elastomeric reinforcement consisting of an elastomer having a JIS hardness of not less than 45 and a maximum thickness of from 3 and 15% of the maximum tire width when the tire is inflated under pressure, the thickness of each said elastomeric reinforcement gradually diminishing as the reinforcement extends toward the corresponding bead and tire equator, and the extension of each elastomeric reinforcement toward the corresponding bead at least partially overlapping the additional reinforcement for each bead, and the elastomer forming the reinforcements having heat conductivity of not smaller than 5 .times. 10.sup.-.sup.4 cal/cm.sup.. sec. .degree.C.