HEAVY DUTY TIRE

In a tire , in a normal state, a profile of a tread surface includes a crown circular arc as a circular arc representing a profile of a portion including an equator PC, and the crown circular arc has a radius of not less than 1600 mm and not greater than 2000 mm. On a ground-contact surface obtained when a load is applied to the tire in the normal state and the tread surface is brought into contact with a flat road surface, an ultra-light load shape index F is higher than a light load shape index F, the ultra-light load shape index F is not less than 1.10 and not greater than 1.20, and the light load shape index F is not less than 1.04 and not greater than 1.14.