| 摘要 |
PROBLEM TO BE SOLVED: To provide a tube-type pneumatic radial tire excellent in bead portion durability.SOLUTION: There is provided a tube-type pneumatic radial tire comprising a tube 5 inserted in the inner face side of a tire. In the pneumatic radial tire, the width AW in a direction orthogonal to a tire equatorial plane from a reference point RP to the center 11c of a bead core 11, and the width BW in a direction orthogonal to the equatorial plane from the reference point RP to the top 13 of a bead toe satisfy the relation of 0.40≤AW/BW≤0.55. The reference point RP is a point at which the horizontal line HL extending in the direction orthogonal to the tire equatorial plane passing through the center 11c of the bead core 11 crosses with a tire outer surface. Besides, the width CW of the bead core 11 in the direction orthogonal to the tire equatorial plane, and the width BW satisfy the relation of 0.45≤CW/BW≤0.55. |
