| 摘要 |
A radial tire structure for a truck and a bus is provided to use a cord with the high tensile quality of the material and having a warp filament removal structure and the reduced number of EPI(End Per Inch) as a steel cord to be applied to a belt layer of a tire, thereby enhancing the durability. A steel chafer for reinforcing a bead portion is applied to the radial tire structure. A steel cord is applied to a belt layer of the tire. The steel cord is a high tensile cord having the carbon content of 0.80 to 0.85% and constructed by a structure of 3+9 x d1(d1 is a diameter of a filament). The cord array per 1 inch is 9 to 11.0 EPI. The d1 is preferably 0.22mm. The steel cord is also constructed by a structure of 3+9 x d2(d2 is a diameter of a filament). The cord array per 1 inch is also 9 to 11.5 EPI. The d2 is preferably 0.20 or 0.22mm.
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