| 摘要 |
<p>A pneumatic radial tire (1) comprises a radial carcass (3) toroidally extending between a pair of bead cores (2), a stiffener (4) disposed above the bead core between the carcass ply (3-1) and its turn-up portion (3-2), and a rubber chafer (5) arranged outside the turn-up portion, wherein a ratio of radially sectional area of the stiffener (4) to radially sectional area of the rubber chafer (5) is not more than 0.5. In this tire, a sidewall-reinforcing rubber layer (10) having a JIS type-A hardness of not less than 80 DEG is arranged along the carcass in a region ranging from a crown portion (6) of the carcass (3) to the bead core (2), whereby the rolling resistance may be reduced without degrading the steering stability. <IMAGE></p> |
