| 摘要 |
A pneumatic radial tire includes a bead portion having a plurality of bead cores, and one or plural radial carcass plies wound up from a tire inner side toward an outer side at the respective bead cores. One-half or more of the number of end portion(s) of the radial carcass ply (plies) wound up on the bead cores is/are positioned at each bead core within a range of 35 to 55% of a tire section height as measured from the reference line of the tire section height. In accordance with this structure, rigidity from the bead portion to a side portion of the tire markedly improves. Accordingly, even when the tire is large and a load applied thereto is increased, deformation of the bead portion in the loaded state is suppressed, a strain level of the bead portion is reduced, and excellent durability of the bead portion is ensured.
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