The Turanza EL400 RFT is Bridgestone's Standard Touring All-Season self-supporting run-flat replacement tire developed for Toyota Sienna* minivans originally equipped with run-flat tires. The Turanza EL400 RFT is designed to combine temporary extended mobility for a distance of at least 50 miles at up to 50 mph even after a puncture has allowed complete air pressure loss with dry, wet and wintertime traction, even in light snow.The Turanza EL400 RFT tires feature an all-season rubber compound molded into a symmetric tread design with straight circumferential grooves to balance dry and wet road traction with noise comfort and hydroplaning resistance. The tire's internal structure includes twin steel belts reinforced by spirally wrapped nylon to blend high-speed durability with uniform ride quality. The structure of the Turanza EL400 RFT features Bridgestone Side Support Run-Flat technology-reinforced sidewalls specifically tuned to temporarily support the vehicle after a puncture causes complete loss of air pressure.*The P225/60RF17 99T-sized Turanza EL400 RFT developed for Toyota Sienna minivans originally equipped with run-flat tires feature Bridgestone's 3rd generation run-flat tire (3G RFT) technology. The 3G RFT tires are designed to offer almost the same riding comfort as conventional tires while continuing to provide temporary extended mobility in the event a puncture allows complete air loss. While Bridgestone's "3G" identification isn't molded on the tire's sidewall, it is visually confirmed by the cooling fin technology molded into the sidewalls as shown in the accompanying photos.