PNEUMATIC RADIAL TIRE

摘要

A pneumatic radial tire comprising a belt layer, comprised of steel cords having a lateral flat cross-section, arranged around an outer periphery of a tread portion of a carcass layer so that the diameter direction of the steel cords is made to follow the planar direction of the belt layer, the steel cord is made a flat 1 x 6 twist structure comprised of filaments of a filament diameter d of 0.20 to 0.40 mm, the long diameter DL and twist pitch P of the steel cord taken out from the tire are made with respect to the filament diameter d as follows: $and\; the\; elongation\; of\; the\; steel\; cord\; caused\; when\; increasing\; a\; load\; from\; 0.25\; kg\; to\; 5.0\; kg\; is\; made\; 0.25\%\; or\; less.\mathop{\mathrm{image}}$