Flame-retardant rubber tires

A flame-retardant rubber tires comprising:

• an outer rubber body portion consisting essentially of a tread rubber layer, a sidewall rubber layer extending inward from each side edge of the tread rubber layer toward the vicinity of a bead portion in radial direction and a rubber chafer layer arranged in the vicinity of the bead portion, and a reinforcing body located inside the outer rubber body portion, at least a portion of the outer rubber body portion comprised of one or more flame-retardant rubber layers having an oxygen index (O.I.) in the range of 19.8 to 27.5, and an absolute value of total (O.I.) .times.S.times.V.times.U values of the flame-retardant rubber layers is not less than 10 as a flame retardance when S is a ratio of surface area of the flame-retardant rubber layer to a full surface area of the outer rubber body portion, V (kg) is a weight of the flame-retardant rubber layer and U is a ratio of weight (kg) of the flame-retardant rubber layer to total weight (kg) of the outer rubber body portion.