| 摘要 |
PROBLEM TO BE SOLVED: To improve a bead durability. SOLUTION: A carcass 6 consists of a body part 6a striding between a pair of bead cores 5 and (5), and a carcass ply 6A having a folded part 6b folded outwardly around an axial direction of a bead core 5. A bead apex rubber 9 is filled in between the body part 6a and the folded part 6b. In a normal state in which a tire is rim assembled and filled with an internal pressure, the body part 6a has an outwardly curved body part area 10 which is located in a neighboring area X of the body part 6a adjoining the bead apex rubber 9, curved convexly outward of the axial direction, and forms a circular arc having a radius of curvature Ra of 90 to 200 mm. The folded part 6b has an inwardly curved folded part area 11 which is located in a neighboring area Z of the folded part 6b adjoining the bead apex rubber 9, curved convexly inward of the axial direction, and forms a circular arc having a radius of curvature Rb of 15 to 35 mm. The body part 6a and the folded part 6b have a proximity area Y in which the outwardly curved body part area 10 and the inwardly curved folded part area 11 close on each other outward of the radial tire direction and extend in that state.
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