Pneumatic radial tire with hybrid band cord

A pneumatic radial tire comprising

• a toroidal carcass ply,
• a breaker belt disposed radially outside the carcass ply, and
• a band belt disposed radially outside the breaker belt,
• the breaker belt comprising at least one ply of parallel, non-metallic cords,
• the band belt comprising a ply of at least one hybrid cord wound spirally and continuously in the circumferential direction of the tire at an angle of 0 to 3 degrees with respect to the tire equator,
• the at least one hybrid cord each comprising a low elastic modulus thread and a high elastic modulus thread which are finally-twisted together,
• the low elastic modulus thread comprising at least one low elastic modulus fiber first-twisted and having an elastic modulus of not more than 2000 kgf/sq.mm, and
• the high elastic modulus thread comprising at least one high elastic modulus fiber first-twisted and having an elastic modulus of not less than 3000 kgf/sq.mm, wherein,
• in the band belt ply, the count E of the at least one hybrid cord per 5 cm width, the stress F1 in kgf of each at least one hybrid cord at 2% elongation, and the stress F2 in kgf of each at least one hybrid cord at 6% elongation satisfies the following relationships:
• F1.times.E<60;
• and
• F2.times.E>150.
• 2.