PNEUMATIC TIRE

PROBLEM TO BE SOLVED: To provide a pneumatic tire that has suppressed the concentration of a ground load on a land end edge during cornering.SOLUTION: In a tread part 16, a plurality of circumferential-direction main grooves extending along a tire circumferential direction is formed, and a first rib 34 and a second rib 38 are formed between the plurality of circumferential-direction main grooves. Arc-shaped first arc-shaped surfaces 34A-1R and 38A-1R with centers in the ribs are formed in the first rib 34 and the second rib 38. Also, second arc-shaped surfaces 34A-2R and 38A-2R which are continuously formed with the first arc-shaped surfaces 34A-1R and 38A-1R respectively, and which have curvature radii smaller than those of the first arc-shaped surfaces 34A-1R and 38A-1R are formed in the first rib 34 and the second rib 38. 【課題】コーナリング時における陸部端縁への接地荷重の集中を抑制させた空気入りタイヤを提供する。【解決手段】トレッド部１６には、タイヤ周方向に沿って延びる複数本の周方向主溝が形成され、複数本の周方向主溝の間に、第１リブ３４、第２リブ３８が形成されている。第１リブ３４、第２リブ３８には、リブ内に中心を有する弧状の第１弧状面３４Ａ−１Ｒ、３８Ａ−１Ｒが形成されている。また、第１リブ３４、第２リブ３８には、第１弧状面３４Ａ−１Ｒ、３８Ａ−１Ｒと各々連続形成され、第１弧状面３４Ａ−１Ｒ、３８Ａ−１Ｒよりも曲率半径が小さい第２弧状面３４Ａ−２Ｒ、３８Ａ−２Ｒが形成されている。【選択図】図３