本发明高内压高载荷子午线轮胎的特征是,至少有1层由相互平行排列的有机纤维帘线(帘线与轮胎胎面中心线构成70~90°角)构成的帘布层从内向外反包的内侧胎体帘布层和至少1层绕钢丝圈从外向内正包的外侧胎体帘布层。胎体帘布层帘线由聚六亚甲基己二酰乙二胺结构单位为95克分子%以上的尼龙66聚合物制成。合股后经粘合剂处理的浸渍帘线的强度(S)为15~9.0 g/d,起始模量(M)为80 g/d以下。 The high internal pressure, high load radial tire of the present invention is characterized in that at least one ply constituted by organic fiber cords arranged parallel to each other (the cords are formed at an angle of 70 to 90 ° with respect to the tire tread centerline) Inner carcass ply and at least one outer carcass ply wrapped outwardly and inwardly about the traveler. The carcass ply cords are made of a nylon 66 polymer having a polyhexamethylene adipamide structure unit of 95 mol% or more. The strength (S) of the impregnated cords treated by the binder after the ply bonding is 15 to 9.0 g / d, and the initial modulus (M) is 80 g / d or less.