提供一种漏气状态下耐久性优异的胎侧补强泄气保用轮胎。泄气保用轮胎在胎侧部配置有外胎侧、支撑层和内胎侧。内胎侧具有分散于橡胶基质中的短纤维。这些短纤维材料为芳纶,短纤维沿径向取向。内胎侧损失角正切tanδ值为0.20以上。胎体帘线为芳纶纤维帘线。芳纶帘线具有将2根初捻纱线捻合的结构。胎体帘线的捻系数T为0.5~0.7。泄气保用轮胎具有CTT外形轮廓。 Provided is a sidewall reinforcing run-flat tire having excellent durability in a leaking state. The run-flat tire is provided with a sidewall, a support layer, and a sidewall on the sidewall portion. The inner sidewall has short fibers dispersed in the rubber matrix. These staple fiber materials are aramid fibers, with short fibers oriented radially. The loss tangent tan δ value is 0.20 or more. Carcass cord is aramid fiber cord. The aramid cord has a structure that twists two primary twisted yarns. The carcass cord twist factor T is 0.5 to 0.7. Deflated tires have the CTT profile.