| 摘要 |
PROBLEM TO BE SOLVED: To provide a pneumatic tire outstandingly suppressing the variation of driveability due to speed variation and temperature environment variation at traveling. SOLUTION: The pneumatic tire is provided with a tread part 1; a side wall part 2; and a bead part 3, and has a carcass layer 5 comprising at least one sheet of carcass ply; a bead filler 8; a belt layer 6 comprising at least one sheet of belt ply; and at least one sheet of belt protection layer 7. As at least one sheet of carcass ply cord of the carcass layer, a cord having thermal contraction stress difference between 30°C to 80°C of 3.0×10<SP>-2</SP>cN/dtex or higher is used, and a reduction ratio of dynamic storage elastic modulus E' from 30°C to 80°C of a rubber of the bead filler 8 is 5% or higher. COPYRIGHT: (C)2008,JPO&INPIT
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