Pneumatic radial tires.

摘要

A pneumatic radial tire comprises at least one belt layer of steel cords between a tread portion and a carcass ply, in which the steel cord satisfies the following conditions: (1) single twisting structure: 1 x n (n= 2-5); (2) ration of flexural rigidity to cord tenacity; 0.04-0.14 (mm<2>); (3) cord tenacity: 20-80 kg; and (4) filament diameter: 0.12-0.20 mm. l