| CPC B60C 11/1392 (2013.01) [B60C 11/0311 (2013.01); B60C 2011/0346 (2013.01); B60C 2011/0348 (2013.01); B60C 2011/0388 (2013.01); B60C 2011/1209 (2013.01); B60C 2011/1213 (2013.01); B60C 2200/06 (2013.01)] | 15 Claims |
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1. A tire, comprising:
a pair of shoulder main grooves;
two or more circumferential narrow grooves disposed between the pair of shoulder main grooves and each having a groove width of 0.5 mm or more and 3.0 mm or less; and
five or more rows of land portions defined and formed by the shoulder main grooves and the circumferential narrow grooves;
among the five or more rows of land portions, a first land portion defined by at least one of the circumferential narrow grooves, and a second land portion located further on a tire equatorial plane side than the first land portion and adjacent to the first land portion being defined,
the first land portion comprising a plurality of S-shaped sipes that extend through the first land portion in a tire width direction,
the second land portion comprising a plurality of S-shaped sipes that extend through the second land portion in the tire width direction, the second land portion being a rib comprising a continuous road contact surface in a tire circumferential direction when the tire comes into contact with a ground, and
connection portions of the S-shaped sipes of the first land portion with respect to the circumferential narrow grooves and connection portions of the S-shaped sipes of the second land portion with respect to the circumferential narrow grooves being at identical positions in the tire circumferential direction; wherein
the S-shaped sipes of the first and second land portions have an S-shape made by smoothly connecting two arcs at one inflection point,
the S-shaped sipes of the first land portion and the S-shaped sipes of the second land portion are inclined in mutually opposite directions with respect to the tire circumferential direction,
the S-shaped sipes of the first land portion and the S-shaped sipes of the second land portion are curved in mutually axisymmetric directions,
the circumferential narrow grooves each have a zigzag shape made by alternately connecting a long portion and a short portion,
the long portion of the circumferential narrow groove has an arc shape that projects toward the tire equatorial plane side, and
an amplitude As of the circumferential narrow groove is in a range 0.10≤As/Wb2≤0.50 with respect to a maximum ground contact width Wb2 of the first land portion.
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