| 摘要 |
A pneumatic tire whose rim slip resistance and durability are improved by optimizing the shape of the bead base is provided. A polygonal bead core 3 having a bottom 2 extending generally along the tire width direction is embedded in a bead portion 1. The bead portion 1 has a bead base 6 extending between a bead heel 4 and a bead toe 5. A maximum displacement point 11 is within a range of 25% or less of the width w of the bottom of the bead core with the third base point 10. The interference ta at the maximum displacement point 11 is 1.1 to 1.3 times as much as the interference tb at the second base point 8. the bead base 6 extends at least between the bead heel 4 and the first base point 8 and has a first tapered portion 12 with a taper angle theta1 being identical with or greater by three degrees or less than a taper angle thetaBS of a bead seat of the standard rim R.
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