<p>A radial tire comprising a toroidal carcass (7) composed of steel cords arranged substantially in parallel to the meridional section of the tire and rubber coating the steel cords and belts (8) composed of steel cords disposed outside the crown portion of the carcass and inside a tread and rubber coating the steel cords. The carbon content and the filament tensile force of the steel cord at least in either of the carcass (7) or the belt (8) of the tire fall each within a predetermined range, the surfaces of the steel cords are plated with cobalt, and 100 % modulus after vulcanizing the coating rubber is 20 kg/cm<2> or above. This tire can be reduced in weight and improved in resistances to separation and corrosion fatigue of the ply ends.</p>
