| 摘要 |
A pneumatic radial tire for truck and bus comprises a carcass ply containing cords arranged substantially in a radial direction of the tire and a belt superimposed about said carcass ply and comprised of plural belt layers each containing steel cords arranged at a cord angle of 5-20 DEG with respect to an equator of the tire. In this case, the steel cord for the belt layer has a two-layer structure of a core (1) comprised of two steel filaments and a single sheath (2) comprised of 6-8 steel filaments and satisfies the particularly relationships on filament diameter, twisting pitch, bending rigidity, tensile strength and distance between adjoining cords. |
