Heavy duty pneumatic tire

A heavy duty pneumatic tire to be mounted on a wheel comprising;

• a tread, two sidewalls, two beads, a radial carcass and a belt composed of at least two plies, of which cords are intersected in the adjacent plies said sidewalls and said carcass arranged substantially symmetrical with the equatorial plane of said tire;
• wherein the radius of curvature of the contour of the tread appearing in a tire cross section including a tire rotary axis is asymmetrical with respect to the tire equatorial plane;
• a larger radius of curvature and a smaller radius of curvature are given to sides of the tire located outside and inside respectively when the tire is mounted on a wheel;
• the difference between the larger radius of curvature and the smaller radius of curvature is not less than 70 mm;
• the rigidity of the tread is larger on the side of the tread with the larger radius of curvature than on the side of the tread with the smaller radius of curvature, when said tire is mounted on a wheel and inflated to a normal inflation pressure arcs of the contour of said tread having the larger and smaller radii of curvature have a common tangent at the equator of said tire, and wherein the larger radius of curvature is from 2.90 to 3.70 times as much as the width of the tread, and the smaller radius of curvature is from 2.25 to 2.60 times as much as the width of the tread.