| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a tire which increases a drive performance and braking performance on a road covered with ice and snow and suppresses a drop in drainage performance and partial wear. <P>SOLUTION: In a circumferential groove 33, an in-groove land portion 70 is formed to rise from a groove bottom 60 of the circumferential groove 33 toward a tread surface. The in-groove land portion 70 is composed of: a first in-groove land portion 70a formed to be in contact with a side face 33a of the circumferential groove 33; and a second in-groove land portion 70b formed to be in contact with a side face 33b of the circumferential groove 33. The groove bottom 60 is situated between the first in-groove land portion 70a and the second in-groove land portion 70b in the direction of a tread width. Thin grooves 80 extending in the direction of the tread width are formed on the first in-groove land portion 70a and the second in-groove land portion 70b. A thick groove width W1 of the circumferential groove 33 in the direction of the tread width is 5 to 30% of a tread width TW of the tread surface in the direction of the tread width. <P>COPYRIGHT: (C)2012,JPO&INPIT |
