Which Cars Use Run-Flat Tires?

[FaithAnn]

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.

[DeJeremiah]

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.

[DelLane]

I previously researched run-flat tire models for a while and found that these are mainly equipped on luxury brand vehicles. Apart from BMW's full range standard configuration, they're also quite common in Mercedes-Benz C-Class and E-Class models, along with some niche choices like the Lexus CT series. Actually, run-flat tires aren't truly explosion-proof; their professional designation is 'tire pressure monitoring system tires'. The biggest advantage is that after a puncture, you can still drive at 80 km/h for about 70-80 kilometers to reach a repair shop. Once, my tire got punctured by a nail, and after the warning, I drove over 40 kilometers before getting it fixed. However, these tires are heavier and noisier. When buying a used car with original run-flat tires, it's best to check if the suspension system has suffered additional wear.

[DeTessa]

My neighbor's BMW X1 came with run-flat tires, which is indeed a convenient feature. Nowadays, many cars come equipped with this type of tire from the factory, especially German models. The Mercedes-Benz C-Class, Volvo S90 top trim, and Cadillac XT5 all have this equipment. Run-flat tires are technically called "tire pressure monitoring system tires," and their wheel design is quite special, allowing them to support the vehicle's weight and continue driving even after a puncture. Last time, I saw a BMW with a blown tire on the highway that could still exit the ramp on its own, thanks to this feature. However, these tires are about 30% heavier than regular tires, which can lead to slightly higher fuel consumption, and you need to slow down when going over potholes to avoid bulging.

[RafaelLee]

I drove my friend's BMW 5 Series, and those run-flat tires are indeed practical. In the market, cars with factory-installed run-flat tires are mostly concentrated in models priced above 300,000 yuan, such as the Mercedes-Benz E-Class, BMW 3 Series, and Volvo XC60. The sidewalls of these tires are particularly thick, so they don't go flat instantly when punctured. I once saw a mechanic disassembling one at a repair shop, and the tire had multiple layers of reinforced structure inside. However, cars equipped with run-flat tires generally don't come with a spare tire, freeing up a lot of space in the trunk. One thing to remind everyone is that repairing run-flat tires is more troublesome than regular tires, and small repair shops might not handle it well, so it's best to go to a professional shop.