HEAVY-DUTY TIRE

In a ground-contact surface shape of a tire, when a tangent angle formed between an axial direction of the tire and a tangent X at each point P on a profile line of the tire is defined as &thetas;, a tangent angle &thetas;1 in a ground-contact end point Pd is 25 DEG or smaller. When a minimum value of the tangent angle &thetas; in a region Y which is separated away from a tire equator C by a distance in a range of not less than 0.4 times but not more than 0.7 times a half of the ground-contact width of the tread is defined as &thetas;2, and a tangent angle at a 0.9 times point Pq which is separated away from the tire equator C by a distance of 0.9 times the half of the ground-contact width of the tread is defined as &thetas;3, a difference (&thetas;3-&thetas;2) is set in a range of not less than -10 DEG but not more than +10 DEG .