| 摘要 |
PURPOSE: A pneumatic tire is provided to reduce rotational resistance when travelling and to improve driving stability and braking performance by using multiple treads having different tan δ without an unreasonable structural change. CONSTITUTION: In a pneumatic tire, a tread top portion(60) which is the top from the depth of a main groove of a tread portion is formed by a general rubber composite, and a tread bottom portion(70) is formed by a rubber composite having tan δ(70°C) 10~30% lower than tan δ(70°C) of the tread top portion.
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