| 摘要 |
PROBLEM TO BE SOLVED: To accomplish both of a low rolling resistance characteristic and an excellent discharging characteristic to a road surface by providing tread under cushion rubber with a specific thickness, a specific width, and rubber physical properties showing tanδand volume resistivity within specific ranges at a specific temperature and providing high conductivity rubber with rubber physical properties showing volume resistivity within a specific range at a specific temperature. SOLUTION: In this pneumatic tire, a tread part is provided with a composite rubber layer constructed of tread rubber consisting of low conductivity rubber on the tire radial outside, sheet type tread under cushion rubber consisting of high conductivity rubber on the tire radial inside, and a high conductivity rubber layer extended radially from the cushion rubber to the tread part surface. The tread under cushion rubber is provided with a thickness of 0.2-1.0 mm, a width of 70% or more of the tread rubber inside face width, and rubber physical properties showing tanδof 0.15-0.25 and volume resistivity within a range of 105-109Ω.cm at 25 deg.C. The high conductivity rubber layer is provided with rubber physical properties showing volume resistivity within a range of 105-106Ω.cm at 25 deg.C.
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