Tire

1. A tire, comprising

a tread surface divided into a plurality of land portions by at least one circumferential groove extending along a tire equator and tread edges, wherein

at least an outline from the tire equator of the tread surface to a tread edge of the tread edges comprises a plurality of arcs each having a different radius of curvature in a width direction cross-sectional view of the tire;

an arc having a minimum radius of curvature among the plurality of arcs lies in a land portion having a maximum tread width direction length among the plurality of land portions;

an arc having a larger radius of curvature is disposed on a tread edge side of the arc having the minimum radius of curvature and disposed at the tread edge; and

the arc having the minimum radius of curvature has a tire width direction length that is 15% to 30% of a tire width direction length of the land portion having the maximum tread width direction length.

2. The tire according to claim 1 , wherein

the tread surface is divided into three land portions by two of the circumferential grooves and the tread edges;

a central land portion located at the tread width direction center among the three land portions has a tread width direction length that is 95% to 105% of the tire width direction length of the land portion having the maximum tread width direction length; and

the tire width direction center of the central land portion is located within a range of 10% or less of a tire width direction length of the central land portion from a tire maximum outer diameter position of the tread surface.

3. The tire according to claim 2 , wherein

the tire maximum outer diameter position is closer to a tread edge side than the tire equator.

4. The tire according to claim 1 , wherein

the tire width direction center of the arc having the minimum radius of curvature is located at 35% to 70% of the tread width direction length of the land portion having the maximum tread width direction length from a tire equator side end of the land portion having the maximum tread width direction length toward the tread edge side.

5. The tire according to claim 4 , wherein

the tread surface is divided into three land portions by two of the circumferential grooves and the tread edges;

a central land portion located at the tread width direction center among the three land portions has a tread width direction length that is 95% to 105% of the tire width direction length of the land portion having the maximum tread width direction length; and

the tire width direction center of the central land portion is located within a range of 10% or less of a tire width direction length of the central land portion from a tire maximum outer diameter position of the tread surface.

6. The tire according to claim 5 , wherein

the tire maximum outer diameter position is closer to a tread edge side than the tire equator.

7. The tire according to claim 1 , wherein

the outline comprises at least three arcs having different radii of curvature.

8. The tire according to claim 7 , wherein

the radii of curvature of the at least three arcs satisfies a relationship of 1 AR> 3 AR> 2 AR, when the at least three arcs are disposed in an order of 1 AR, 2 AR and 3 AR from the tire equator toward the tread edge.

9. The tire according to claim 8 , wherein

the tire width direction center of the arc having the minimum radius of curvature is located at 35% to 70% of the tread width direction length of the land portion having the maximum tread width direction length from a tire equator side end of the land portion having the maximum tread width direction length toward the tread edge side.

10. The tire according to claim 8 , wherein

the tread surface is divided into three land portions by two of the circumferential grooves and the tread edges;

a central land portion located at the tread width direction center among the three land portions has a tread width direction length that is 95% to 105% of the tire width direction length of the land portion having the maximum tread width direction length; and

the tire width direction center of the central land portion is located within a range of 10% or less of a tire width direction length of the central land portion from a tire maximum outer diameter position of the tread surface.

11. The tire according to claim 10 , wherein

the tire maximum outer diameter position is closer to a tread edge side than the tire equator.

12. The tire according to claim 7 , wherein

the tire width direction center of the arc having the minimum radius of curvature is located at 35% to 70% of the tread width direction length of the land portion having the maximum tread width direction length from a tire equator side end of the land portion having the maximum tread width direction length toward the tread edge side.

13. The tire according to claim 7 , wherein

the tread surface is divided into three land portions by two of the circumferential grooves and the tread edges;

a central land portion located at the tread width direction center among the three land portions has a tread width direction length that is 95% to 105% of the tire width direction length of the land portion having the maximum tread width direction length; and

the tire width direction center of the central land portion is located within a range of 10% or less of a tire width direction length of the central land portion from a tire maximum outer diameter position of the tread surface.

14. The tire according to claim 13 , wherein

the tire maximum outer diameter position is closer to a tread edge side than the tire equator.