| 摘要 |
A studless tire capable of exhibiting excellent performances on both icy road and snow-covered road, including tread portion 2 having a pair of middle circumferential grooves 3 b each extending in a region between 15% and 25% of tread width TW from tire equator C to provide crown region CR between the middle grooves 3 b and a pair of shoulder regions Sh between the middle groove 3 b and ground contact edge E, wherein the crown region CR includes rows R 1, R 2 of blocks B having sipes S and defined by zigzag inner circumferential grooves 3 a and crown lateral grooves 4 a, 4 b, each shoulder region Sh includes rows R 3, R 4 of blocks B having sipes S and defined by linear outer circumferential grooves 3 c and shoulder lateral grooves 4 c, 4 d, and groove area rate Gs (%) of shoulder regions Sh is larger than groove area rate Gc (%) of crown region CR so that the difference (Gs-Gc) is from 3 to 7%.
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