| 摘要 |
<p>A pneumatic radial tire exhibiting excellent steering stability at the time of low speed traveling and at the time of high speed traveling. The pneumatic radial tire is characterized in that a belt (5) is provided with at least one belt reinforcing layer (6A, 6B) on the radially outer side of the tire, and a reinforcing element constituting the belt-reinforcing layer (6A, 6B) is a polyketone fiber cord satisfying the conditions of the following formulas (I) and (II).: s=-0.01×E+1.2 ... (I) s=0.02 ... (II) [In the formulas, s is the thermal contraction stress (cN/dtex) at 177°C, and E is the modulus of elasticity (cN/dtex) under a loading of 49N at 25°C].</p> |
