| 摘要 |
PROBLEM TO BE SOLVED: To provide a pneumatic tire capable of enhancing the rim detachment resistant performance while suppressing degradation of the rim assembly performance. SOLUTION: The pneumatic tire has bead portions having a bead base surface Sb seated on a rim base surface of a rim, and a bead outer wall surface Sw which is continuous to a bead heal point Ph located on the outer end in the tire axial direction of the bead base surface and supported by a flange surface of the rim. In the tire meridian section including the tire axis, the bead base surface Sb consists of a straight base part 20, and a protruding circular arc part 21 which is protruded in the radial direction inward of the extended line N of the base part 20 to the bead heal point Ph from an outer end 20e of the base part 20. The protruding circular arc part 21 has a radius of curvature of from 0.20 to 0.33 time the base width W1 in the tire axial direction of the bead base surface Sb, and a height Hd from the extended line N of from 0.067 to 0.13 time the base width W1 in the tire width direction of the bead base surface. The bead heal point Ph is located on the extended line N. COPYRIGHT: (C)2007,JPO&INPIT
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