TYRE

A tyre has a tread portion provided with a rib. The rib is provided with a lateral groove extending so as to completely cross the rib. The lateral groove includes a first curved portion and a second curved portion. The first curved portion extends from a first end in a curved shape convex in a first direction in a tyre circumferential direction. The second curved portion extends from the second end in a curved shape convex in a second direction in the tyre circumferential direction. A groove width of the first curved portion is gradually increased over the entire length thereof as it goes toward the first end, or a groove width of the second curved portion is gradually increased over the entire length thereof as it goes toward the second end.