TIRE

In a tire 2, a shape index of a reference ground contact surface is not less than 1.20 and not greater than 1.50. In the tire 2, a tread 4 includes a cap layer 38, an intermediate layer 40 formed such that a loss tangent of the intermediate layer 40 at 30°C is less than a loss tangent of the cap layer 38 at 30°C, and a base layer 42 formed such that a loss tangent of the base layer 42 at 30°C is less than the loss tangent of the intermediate layer 40 at 30°C. In the radial direction, the intermediate layer 40 is disposed outwardly of the base layer 42 and the cap layer 38 is disposed outwardly of the intermediate layer 40. In a shoulder land portion 28s of the tread 4, a thickness Tm of the cap layer 38 at a center Pm of an axial width is less than a thickness Tg of the cap layer 38 on the shoulder circumferential groove 26s side.