| CPC B60C 3/04 (2013.01) [B60C 11/0083 (2013.01); B60C 13/02 (2013.01); B60C 2009/2214 (2013.01); B60C 2009/2228 (2013.01); B60C 2200/04 (2013.01)] | 15 Claims |
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1. A tire comprising:
a pair of beads;
a carcass that bridges between the pair of beads;
a tread that is positioned radially outside the carcass;
a band that is positioned between the carcass and the tread;
an outer surface having a tread surface that is in contact with a road surface, and a pair of side surfaces that are continuous with the tread surface,
a pair of sidewalls that are positioned axially outside the carcass; and
a pair of clinches that are positioned radially inside the sidewall,
wherein the tread includes the tread surface,
the tread surface includes an equator that is an intersection point with an equatorial plane,
the band includes a band cord that extends substantially in a circumferential direction,
the band includes a center portion that intersects with the equatorial plane, and a pair of side portions that are positioned axially outside the center portion,
the center portion has a stiffness higher than a stiffness of the side portions,
each of the side surfaces includes a maximum width position indicating a maximum width of the tire,
in a meridional cross section of the tire,
an intersection point of a bead baseline and the equatorial plane is a first reference point,
an intersection point of a straight line passing through the equator and extending in an axial direction and a straight line passing through the maximum width position and extending in a radial direction is a second reference point,
a line segment connecting the first reference point and the second reference point is a reference line segment,
an intersection point of the reference line segment and the outer surface of the tire is a shoulder reference point, and
a line segment connecting the first reference point and the shoulder reference point is a shoulder line segment,
a contour line of the tread surface is formed by a plurality of arcs arranged in the axial direction,
the plurality of arcs include a center arc that is an arc passing through the equator, a pair of shoulder arcs each of which is positioned on an outermost side in the axial direction and has a smallest radius, a pair of middle arcs each of which is positioned adjacent to the center arc and has a radius smaller than a radius of the center arc, and a pair of side arcs each of which is positioned between the middle arc and the shoulder arc and has a radius smaller than the radius of the middle arc,
a protrusion that protrudes outward from the outer surface of the tire and extends in a circumferential direction is provided at a boundary portion between the tread and the sidewall,
the outer surface of the tire includes a serration region between the shoulder reference point and the maximum width position,
the serration region includes a plurality of narrow grooves that extend in the circumferential direction, and a ridge that is positioned between the narrow grooves adjacent to each other,
the serration region is positioned radially inside the protrusion, and
a total of a height of the protrusion and a maximum depth of the narrow groove is 0.5 mm or more and 0.9 mm or less,
a ratio of a length of the shoulder line segment to a length of the reference line segment is 85.9% or more and 89.3% or less, and
a ratio of the radius of the center arc to the radius of the middle arc is 1.85 or more and 2.00 or less.
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