Abstract: A pneumatic tire includes a tread surface having a plurality of main grooves extending straight in a circumferential direction of the tire. The plurality of main grooves defines land portions extending in the tire circumferential direction. The land portions each have a ground contact surface comprising a first circular are having a single curvature radius in tire meridian cross section. The ground contact surface of at least the land portion which is located second when counted from the outer side of a vehicle when the tire is mounted thereon, is arranged so as to have the first circular are and at least a second circular are connected thereto on the vehicle outer side thereof. The circular are located closer to the vehicle outer side has a smaller curvature radius and is positioned more inwardly away from the tread surface.

Abstract: A pneumatic tire includes a tread surface having a plurality of main grooves extending straight in a circumferential direction of the tire. The plurality of main grooves defines land portions extending in the tire circumferential direction. The land portions each have a ground contact surface comprising a first circular arc having a single curvature radius in tire meridian cross section. The ground contact surface of at least the land portion which is located second when counted from the outer side of a vehicle when the tire is mounted thereon, is arranged so as to have the first circular arc and at least a second circular arc connected thereto on the vehicle outer side thereof. The circular arc located closer to the vehicle outer side has a smaller curvature radius and is positioned more inwardly away from the tread surface.