| 摘要 |
PROBLEM TO BE SOLVED: To suppress the occurrence of abnormal noise due to uneven wear of a land part or rubbing of the land part with a road surface by suppressing a decrease in rigidity of the land part while improving a brake performance on an ice road surface by a sipe provided on the land part.SOLUTION: A sipe 10 provided in a land part 1 is sequentially provided with, from an opening end 12 of a tread surface to a depth side D1 in a sipe depth direction, a first wide part 14 wider than the opening end 12, a constriction part 16 narrower than the first wide part 14, and a second wide part 18 wider than the constriction part 16. Groove side walls 10a of opposed sipes 10 are separate from each other to make the groove width gradually expand from the opening end 12 of the tread surface toward the first wide part 14, and groove side walls 10a of opposed sipes 10 approach each other to make the groove width gradually narrower from the first wide part 14 toward the constriction part 16. Groove side walls 10a of opposed sipes 10 are separate from each other to make the groove width gradually expand from the constriction part 16 toward the second wide part 18. |
