| 摘要 |
<p>Provided is a run-flat tire which has an excellent run-flat performance as well as a high high-speed straight running stability in the non-punctured state, a high steering stability on both of a dry road surface and a wet road surface and a good fuel efficiency. A run-flat tire which comprises at least two cross belt layers formed by rubberizing a steel cord and a tread rubber located successively, wherein a reinforcing rubber is provided inside a carcass. The above-described steel cord has a single twisted structure or a core/single layered sheath structure consisting of 6 to 10 steel strands having a strand diameter of 0.10 to 0.20 mm. The density of the implanted steel cords is 40 cords/50 mm or more and the distance between the adjacent steel cords in the belt layer is 0.3 mm or longer. Moreover, the dynamic storage modulus E' (MPa) at 30°C of the tread rubber and tand at 60°C of the same respectively satisfy the relationships represented by the formulae: 5.0=E' and 0.050=tand=0.240.</p> |
