Tire
A tire that allows enhancement of running performance on a deep snow road surface is provided. A tire 1 includes a first shoulder block 3 . The first shoulder block 3 includes a first tread surface 5 extending inward from a first tread end T 1 in the tire axial direction, a first side surface 6 extending inward from the first tread end T 1 in the tire radial direction, and a second tread surface 7 extending outward from the first side surface 6 in the tire axial direction. The second tread surface 7 extends at an angle θ of 10° or less relative to a contact line 5 n extending in contact with the first tread surface 5 through the first tread end T 1 . At least one groove 8 is disposed in the second tread surface 7.
1 . A tire comprising:
a tread portion including a first tread end, and at least one first shoulder block including the first tread end,
the first shoulder block includes
a first tread surface extending inward from the first tread end in a tire axial direction,
a first side surface extending inward from the first tread end in a tire radial direction, and
a second tread surface extending outward from the first side surface in the tire axial direction,
an edge formed at a point at which the first side surface and the second tread surface intersect each other,
the second tread surface extends at an angle of 10° or less relative to a contact line extending in contact with the first tread surface through the first tread end, on a tire meridional cross section of the first shoulder block, and
at least one groove is in the second tread surface,
wherein a length of the second tread surface in the tire axial direction is 18% to 23% of a length of the first tread surface of the first shoulder block in the tire axial direction.
2 . The tire according to claim 1 , wherein
the tread portion includes a first shoulder lateral groove that is adjacent to the first shoulder block and extends in the tire axial direction, and
the second tread surface is outward of a groove bottom of the first shoulder lateral groove in the tire radial direction.
3 . The tire according to claim 1 , wherein
the groove has an end portion that terminates in the second tread surface.
4 . The tire according to claim 1 , wherein
the groove has an end portion that terminates in the first side surface.
5 . The tire according to claim 1 , wherein
the groove extends in the tire axial direction.
6 . The tire according to claim 1 , wherein
the at least one groove includes a plurality of the grooves in the second tread surface.
7 . The tire according to claim 1 , wherein
the groove has a width of 1.5 to 3.5 mm.
8 . The tire according to claim 1 , wherein
the first shoulder block includes a first rubber portion including the first tread surface and a second rubber portion including the second tread surface, and
a rubber hardness of the second rubber portion is less than or equal to a rubber hardness of the first rubber portion.
9 . The tire according to claim 8 , wherein
the rubber hardness of the second rubber portion is less than the rubber hardness of the first rubber portion.
10 . The tire according to claim 1 , wherein
the tread portion includes a second tread end outward of the first tread end in the tire axial direction, and a second shoulder block including the second tread end, and
the first shoulder block and the second shoulder block alternate in a tire circumferential direction.
11 . The tire according to claim 7 , wherein
the tread portion further includes a first shoulder lateral groove extending outward in the tire axial direction beyond the first tread end and is adjacent to the first side surface and the second tread surface in the tire circumferential direction;
the width of the groove is within 2.0 mm and 3.0 mm, and
a ratio of the depth of the groove to the depth of the first shoulder lateral groove is within 20% and 30%.
12 . A tire comprising:
a tread portion including a first tread end, and at least one first shoulder block including the first tread end,
the first shoulder block includes
a first tread surface extending inward from the first tread end in a tire axial direction,
a first side surface extending inward from the first tread end in a tire radial direction, and
a second tread surface extending outward from the first side surface in the tire axial direction,
the second tread surface extends at an angle of 10° or less relative to a contact line extending in contact with the first tread surface through the first tread end, on a tire meridional cross section of the first shoulder block, and
at least one groove is in the second tread surface,
wherein the groove has an outer end portion in the tire radial direction radially inward of a mid-point of the first side surface in the tire radial direction; and
no groove is formed on a portion of the first side surface that is outward of the mid-point in the tire radial direction.
13 . The tire according to claim 12 , wherein
the tread portion further includes a first shoulder lateral groove extending outward in the tire axial direction beyond the first tread end and is adjacent to the first side surface and the second tread surface in the tire circumferential direction;
the width of the groove is within 2.0 mm and 3.0 mm, and
a ratio of the depth of the groove to the depth of the first shoulder lateral groove is within 20% and 30%.
14 . A tire comprising:
a tread portion including a first tread end, and at least one first shoulder block including the first tread end,
the first shoulder block includes
a first tread surface extending inward from the first tread end in a tire axial direction,
a first side surface extending inward from the first tread end in a tire radial direction, and
a second tread surface extending outward from the first side surface in the tire axial direction,
the second tread surface extends at an angle of 10° or less relative to a contact line extending in contact with the first tread surface through the first tread end, on a tire meridional cross section of the first shoulder block,
a plurality of grooves is formed in the second tread surface, and
a length of the second tread surface in the tire axial direction is 18% to 23% of a length of the first tread surface of the first shoulder block in the tire axial direction.
15 . The tire according to claim 14 , wherein a sipe is formed in the first tread surface and the sipe faces the grooves formed in the second tread surface.