Pneumatic safety tire

In a pneumatic safety tire having a carcass composed of at least one radial cord ply toroidally extending from a tread portion, through two sidewall portions, to two inner bead portions;

• a belt arranged on the carcass layer so as to cover the crown portion thereof between two shoulder portions of the tire;
• an inner liner extending throughout between the both bead portions on the inner surface of the carcass;
• and a pair of crescent-shaped cross-section reinforcing layers located between the carcass and the inner liner in each of the sidewall portions, wherein each of said reinforcing layers has a thickest portion thereof at substantially the middle of each of the sidewall portions extending from the shoulder portion to the head portion the improvement wherein each of said crescent-shaped cross-section reinforcing layers comprises:
• (a) a higher elastic rubber layer G.sub.1 having an elastic modulus of 25 to 60 kg/cm.sup.2 in tensile stress when elongation strain is 100% and combined with the inner surface of said carcass at the sidewall portion of the tire;
• and
• (b) an anticrack rubber layer G.sub.2 having an elastic modulus of 10 to 30 kg/cm.sup.2 in tensile stress in said condition but smaller than that of said elastic rubber layer G.sub.1 and arranged such that at least part of an outer surface thereof is combined with said elastic rubber layer G.sub.1 and an inner surface thereof is combined with said inner liner, respectively at a volume ratio of said higher elastic rubber layer G.sub.1 to said anticrack rubber layer G.sub.2 as 1<G.sub.1 /G.sub.2 <10.