A tire comprising: a tread portion for which an intended rotational direction of the tire is specified, the tread portion having a tread surface and a first tread edge on one side in the tire axial direction, the tread portion provided with a plurality of first inclined grooves extending from the first tread edge toward the tire equator while inclining to a heel side in the intended rotational direction, and the tread portion including a plurality of first inclined land portions defined between the first inclined grooves, wherein at least one of the first inclined land portions comprising an outer portion on the first tread edge side and an inner portion on the tire equator (c) side, the outer portion has a first wall surface defined by one of the adjacent first inclined grooves on the heel side of the outer portion, and a second wall surface defined by one of the adjacent first inclined grooves on the toe side of the outer portion, and the inner portion has a third wall surface defined by one of the adjacent first inclined grooves on the heel side of the inner portion, and a fourth wall surface defined by one of the adjacent first inclined grooves on the toe side of the inner portion, wherein the angle θ1 of the first wall surface is smaller than the angle θ2 of the second wall surface, and the angle θ3 of the third wall surface is larger than the angle θ4 of the fourth wall surface, each angle being with respect to a normal line to the tread surface, characterized in that the angle θn of any one selected from the first wall surface, the second wall surface, the third wall surface and the fourth wall surface, and the groove width wn and the depth Dn of the first inclined groove formed by the selected wall surface satisfy the following condition: 0 =< (Dn × tan θn)/Wn =< 0.2. a tread portion for which an intended rotational direction of the tire is specified, the tread portion having a tread surface and a first tread edge on one side in the tire axial direction, the tread portion provided with a plurality of first inclined grooves extending from the first tread edge toward the tire equator while inclining to a heel side in the intended rotational direction, and the tread portion including a plurality of first inclined land portions defined between the first inclined grooves, wherein at least one of the first inclined land portions comprising an outer portion on the first tread edge side and an inner portion on the tire equator (c) side, the outer portion has a first wall surface defined by one of the adjacent first inclined grooves on the heel side of the outer portion, and a second wall surface defined by one of the adjacent first inclined grooves on the toe side of the outer portion, and the inner portion has a third wall surface defined by one of the adjacent first inclined grooves on the heel side of the inner portion, and a fourth wall surface defined by one of the adjacent first inclined grooves on the toe side of the inner portion, wherein the angle θ1 of the first wall surface is smaller than the angle θ2 of the second wall surface, and the angle θ3 of the third wall surface is larger than the angle θ4 of the fourth wall surface, each angle being with respect to a normal line to the tread surface, characterized in that the angle θn of any one selected from the first wall surface, the second wall surface, the third wall surface and the fourth wall surface, and