TIRE

A tire comprises a tread portion for which an intended tire rotational direction is specified. The tread portion comprises rows composed of blocks circumferentially divided by lateral grooves. Each block has a ground contacting top surface, and a first side wall surface and a second side wall surface located on a heel-side and a toe-side, respectively, in the intended tire rotational direction. In a cross section of each block which is parallel with the tire circumferential direction, the first and second block-side wall surfaces are both inclined, and the angle θ of the second side wall surface is larger than the angle θ of the first side wall surface with respect to the tire radial direction. The difference θ between the angles θ and θ increases toward one side in the tire axial direction.