Can Run-Flat Tires Still Run Without Air?
2 Answers
Run-flat tires can still run without air. Even if the tire loses all air pressure, it can continue to drive at a speed of 80 kilometers per hour without the need for immediate tire replacement. The differences between run-flat tires and traditional tires include run-flat characteristics, reinforced sidewalls, additional valve stem strips, and high-heat-resistant synthetic rubber materials. The tire pressure monitoring system included in run-flat tires monitors the air pressure of each tire by continuously comparing the rotation speeds of individual tires. When the vehicle speed exceeds 15 kilometers per hour or the tire pressure drops by more than 30%, if the rotation speed of a tire changes irregularly, the system will alert the driver through warning lights and audible signals.
Run-flat tires can indeed continue to drive when deflated, which is a key feature of their design. I've been driving a car with run-flat tires for several years, and I remember one time on the highway when the tire had a puncture and lost all air pressure, but the car didn't break down immediately. The principle is that the sidewalls of the tire are reinforced to bear the weight of the vehicle, allowing it to be driven at a lower speed—usually around 80 kilometers, with the speed not exceeding 80 kilometers per hour. However, don't think it's okay to keep driving indefinitely; delaying too long may cause the tire to be completely ruined or damage the wheel rim, affecting the suspension system. For safety, I would immediately reduce speed, use hazard lights to alert other vehicles, and head straight to the nearest repair shop for inspection. Even if it can run, this is not a permanent solution—once the tire loses air, its internal structure is already damaged and must be replaced or repaired, or it could cause major problems the next time you drive. Regularly checking tire pressure and wear can prevent this situation from happening.
