Heavy duty radial tire

A heavy-duty radial tire comprising:

• a radial carcass toroidally extending between a pair of bead cores embedded in respective bead portions;
• a tread rubber;
• a reinforcement belt comprised of at least one wide-width rubberized slant cord layer containing cords arranged obliquely with respect to an equatorial plane;
• a high strength belt located inside the reinforcement belt in a radial direction of the tire and comprised of at least one narrow-width rubberized slant cord layer containing cords arranged obliquely with respect to the equatorial plane of the tire, wherein:
• the reinforcement belt and the high strength belt are arranged between a crown portion of the radial carcass and the tread rubber;
• an intersect angle between a cord in a radially innermost wide-width slant cord layer constituting the reinforcement belt and a cord in a radially outermost narrow-width slant cord layer constituting the high strength belt is not less than 10° as measured at an acute angle side;
• in a widthwise section of the tire when the tire is mounted onto an approved rim and inflated under maximum air pressure corresponding to a maximum load capacity, the at least one narrow-width slant cord layer constituting the high strength belt has a width corresponding to 20-60% of a ground contact width of the tread rubber and an inclination angle of not more than 15° with respect to the equatorial plane of the tire;
• a first rubber layer is located between the radially innermost wide-width slant cord layer and the radially outermost narrow-width slant cord layer;
• and
• a rubber gauge between the cord in the radially innermost wide-width slant cord layer and the cord in the radially outermost slant cord layer is within a range of 0.9-3.0 times a diameter of the cord in the radially outermost narrow-width slant cord layer.