What is a Run-Flat Tire?
2 Answers
Run-flat tires, also known as anti-blowout tires, are designed to allow a vehicle to continue driving at low speeds even when the tire is deflated or leaking. They effectively prevent tire blowouts, avoid vehicle loss of control, and enhance driving safety. In the event of a tire deflation, the vehicle can still travel up to 80 kilometers at a speed of 80 kilometers per hour. Run-flat tires consist of an outer tire, a standard inner tube, a spare inner tube, a steel rim, a gas generator, a pressure sensor, and a control unit. To prevent the tire from detaching from the rim after deformation, the rim is specially designed with raised edges that keep the tire in place even when pressure drops suddenly.
Run-flat tires, commonly known as the type that can continue driving for a distance after a puncture or blowout, unlike regular tires that become immobile and require immediate spare tire replacement upon air loss. Their secret lies in thickened sidewalls or the use of ultra-resilient materials, enabling them to support the vehicle's weight even at zero tire pressure—allowing you to drive dozens of kilometers on a flat tire to a repair shop without issue. These tires were initially introduced by premium brands like BMW and Mercedes-Benz, as they eliminate the need for a spare tire, freeing up trunk space. In terms of user experience, they indeed offer enhanced safety; for instance, encountering a nail on the highway won't risk loss of control. However, drawbacks include higher cost, increased noise, stronger vibrations, and significantly reduced comfort. Nowadays, many vehicles come standard with them—look for sidewall markings such as "RFT" or "Run-Flat" when purchasing tires. Personally, having driven a car equipped with these tires, the highlight is saving the hassle of carrying a bulky spare tire on long trips, though they feel too bumpy for city commuting, requiring a balance between safety and comfort. Before installation, ensure your vehicle's design supports them, such as having a compatible suspension system, to avoid potential damage to the suspension.
