| 摘要 |
A pneumatic radial tire having a circular bead core of substantially polygonal cross section which includes a base (a) adjacent an inclined bead base portion of the tire, an inner side (b) on a side of the bead core nearest a bead toe portion of the tire, an outer side (d) on a side of the bead core nearest a bead heel portion of the tire, and a top side (c) opposite the base (a) and joining the inner side (b) and the outer side (d). An inclination theta 1 of the base (a) relative to the axial direction of the tire is substantially the same as that of the bead base portion relative to the axial direction of the tire. A cross angle beta between the base (a) and the inner side (b) is 70 DEG to 90 DEG . An inclination theta 2 of the top side (c) relative to the axial direction of the tire is smaller than the inclination theta 1 and the direction of inclination of the top side (c) is opposite to that of the base (a).
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