| 摘要 |
A tread area is divided into a plurality of lands by a plurality of grooves formed in the tread area. Each of the grooves includes a plurality of protrusions arranged at intervals on a bottom of the groove. The protrusions are lower than the lands from the bottom of the groove, and separated from the lands. Each of the protrusions includes a protrusion main body having a top portion that is a highest portion from the bottom of the groove, and a slope portion having a slop that makes an angle with the bottom of the groove in a range between 3 degrees and 60 degrees. The slope portion is formed in at least one direction along the groove.
|
