| 摘要 |
PROBLEM TO BE SOLVED: To restrain generation of squeal sound while decreasing rolling resistance by arranging a rubber composition having a value of the loss tangent larger than that of a rubber composition for constituting a tread by the specified value on a shoulder part of the tread as well as by constituting the tread by the rubber composition having the loss tangent in the specified range. SOLUTION: A tread 4 is constituted of a rubber composition A having the loss tangent tanδin the range of 0.13 to 0.30 at the temperatures of 60 deg.C. A rubber composition B having the loss tangent tanδat the temperatures of 60 deg.C larger than that of the rubber composition A by 0.07 is arranged on a shoulder part including the tread end of the tread. Therefore, low rolling resistance of the rubber composition A is exhibited in straight traveling, and generation of squeal sound can be restrained by the rubber composition B having high tanδand arranged on the shoulder part when the ground contact center is moved to the shoulder side in turning. That is, generation of squeal sound can be restrained while decreasing rolling resistance.
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