How many kilometers can a run-flat tire drive without air?
3 Answers
Run-flat tires can drive approximately 80 kilometers without air. The main purpose of run-flat tires is to prevent the vehicle from losing control in the event of sudden tire pressure loss. Below is an introduction to run-flat tires: 1. Introduction to run-flat tires: Run-flat tires, technically known as "pressure-retaining tires," rely on the inflated tire sidewall as the main support for the vehicle's weight, especially for tires with a larger aspect ratio (the ratio of tire height to width), where the sidewall is very "thick." 2. The difference between run-flat tires and ordinary tires: The sidewall of run-flat tires is very thick, and the inflated tire sidewall is the main support for the vehicle's weight. 3. The structure of run-flat tires: Run-flat tires consist of an outer tire, a common inner tire, a spare inner tire, a steel rim, a gas generator, a pressure sensor, and a control unit. Run-flat tires have special symbols after the specifications on the tire sidewall, which ordinary tires do not have.
As someone who's worked in auto repair shops for over a decade, I know run-flat tires can go about 80 kilometers when leaking, but speed must be kept under 80km/h. Last time a customer drove 70 kilometers to my shop with a nail in the tire - the tire was still repairable, but the rim was nearly deformed. I recommend driving to repair immediately when flat, don't delay, or the suspension system could be damaged. Run-flat tires rely on special support belts to bear weight temporarily, not permanently, and tire pressure needs readjustment after driving. Regular maintenance should include frequent checks of tire pressure sensors to prevent sudden incidents. In short, this feature is useful, but don't rely on it too long - 80 kilometers is the absolute limit.
My family has two cars equipped with run-flat tires. Once, while driving my child to a tutoring class, we suddenly had a flat tire. We drove slowly for 60 kilometers to the 4S shop, and it felt much more stable. These tires can last about 80 kilometers without air, and it's especially important to keep the speed below 80 km/h—going too fast can damage the internal structure. Safety comes first, especially when driving with kids—it gives me peace of mind. However, I’d like to remind everyone not to forget about it after driving; you’ll need to replace the tire or spend extra on repairs later. I check the tire pressure myself every month to ensure it’s within the normal range. The advantage of run-flat tires is eliminating the risk of sudden blowouts, but it’s best to have a backup plan for long trips, as 80 kilometers might not always be enough. Overall, they’re practical, but remember to use them wisely.
