| 摘要 |
PROBLEM TO BE SOLVED: To improve drainage performance, and enhance a degree of freedom of design of groove arrangement by arranging a surface layer having high self-cleaning performance at least in a part or the whole area of a groove bottom and a groove wall of a groove to partition and form a land part. SOLUTION: A rubber layer 1 having high self-cleaning performance, an ordinary tread rubber layer 2 and a belt layer 3 are provided. In the rubber layer 1, when its thickness is denoted by (tC) and a thickness of the tread rubber layer 2 is denoted by (tG), it is better to set these in (tC<0.1 tG). With regard to a characteristic of the rubber layer 1, in order to enhance water repellency, when self-cleaning performance is expressed by a contact angled formed with a waterdrop on a surface of the rubber layer 1, it is preferable to set a difference from the tread rubber layer 2 not less than 5 degrees. |
