Which Cars Use Run-Flat Tires?
2 Answers
Run-flat tires are used in brands such as BMW, Volvo S60, Ford S-MAX, Volkswagen R36, Mercedes-Benz, Audi, and others. Below is relevant information about run-flat tires: 1. Introduction to run-flat tires: Run-flat tires, technically known as "tire pressure monitoring system tires," rely on the inflated tire sidewall to support the vehicle's weight, especially in 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 regular tires: Run-flat tires have very thick sidewalls, and the inflated tire sidewall is the main part supporting 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 following the specifications on the tire sidewall, which regular tires do not have.
Regarding the issue of run-flat tires, strictly speaking, they should be called 'tire pressure monitoring systems' or 'run-flat tires.' Many high-end car brands come equipped with these tires as standard. BMW is particularly adept at this, equipping everything from the entry-level 1 Series to the flagship 7 Series with run-flat tires, including the X Series SUVs. On the Mercedes side, models like the C-Class, E-Class, and some SUVs also come with them, while Audi often offers them as optional extras for the Q3 and Q5. Once, my friend drove his 3 Series with a flat tire all the way to the repair shop thanks to these tires. The sidewalls of run-flat tires are exceptionally rigid, allowing the car to keep moving even when the tire loses pressure. However, the downside is reduced comfort—they can make driving over speed bumps quite bumpy. It's advisable to pay attention to the tire pressure monitoring system when driving such cars, as repairs are more expensive than for regular tires. Replacing one can cost over a thousand yuan.
