| 摘要 |
A pneumatic radial tire has at least one carcass reinforcing ply and a pair of opposing bead portions. Each bead portion has a bead core and a bead apex, while the carcass reinforcing ply has a main portion and two turnups, with one turnup extending from each end of the main portion and having a terminal end. In each bead portion, there is a minimum distance D<SUB>MIN </SUB>between the carcass main portion and the carcass turnup, as measured perpendicular to the tire equatorial plane EP. The distance D<SUB>MIN </SUB>is not less than 50% of the maximum bead core width W<SUB>B </SUB>as measured perpendicular to the equatorial plane EP. In each bead portion, radially outward of the minimum distance D<SUB>MIN</SUB>, a radially outermost portion of the carcass turnup extends at an angle so the radially outermost portion of the carcass turnup is divergent from the carcass main portion.
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