| CPC B60C 11/03 (2013.01) [B60C 11/0327 (2013.01); B60C 2011/0353 (2013.01); B60C 2011/0355 (2013.01); B60C 2011/039 (2013.01)] | 13 Claims |
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1. A tire comprising:
a tread portion having tread edges and provided with circumferentially continuously extending circumferential grooves including
two crown circumferential grooves disposed one on each side of a tire equator, and two shoulder circumferential grooves respectively disposed axially outside the two crown circumferential grooves, so that the tread portion is divided into a crown land region located between the two crown circumferential grooves,
two shoulder land regions located axially outside the two shoulder circumferential grooves, respectively, and
two middle land regions located between the two crown circumferential grooves and the two shoulder circumferential grooves,
wherein
each shoulder land region comprises
a shoulder inner area demarcated axially inside from a center position in the tire axial direction of the shoulder land region, and
a shoulder outer area demarcated axially outside from the center position of the shoulder land region, and
each middle land region comprises
a middle inner area demarcated axially inside from a center position in the tire axial direction of the middle land region, and
a middle outer area demarcated axially outside from the center position of the middle land region,
under a standard loaded state of the tire in which the tire is mounted on a standard rim, inflated to a standard inner pressure, loaded with a standard tire load, and in contact with a flat surface with zero camber angle:
an average ground contact pressure of each shoulder land region is in a range from 1.15 to 1.35 times an average ground contact pressure of the crown land region;
an average ground contact pressure of each middle land region is smaller than the average ground contact pressure of each shoulder land region and larger than the average ground contact pressure of the crown land region;
an average ground contact pressure of said shoulder outer area is in a range from 1.1 to 1.4 times an average ground contact pressure of said shoulder inner area;
the average ground contact pressure of said shoulder inner area is larger than the average ground contact pressure of the crown land region;
an average ground contact pressure of said middle outer area is smaller than an average ground contact pressure of said middle inner area; and
each shoulder land region is provided with shoulder axial grooves each extending axially inwardly from the adjacent tread edge at least in the adjacent shoulder outer area.
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