What are the differences between run-flat tires and ordinary tires?
3 Answers
The specific differences between run-flat tires and ordinary tires are as follows: Structure: The sidewalls of run-flat tires are thicker than those of ordinary tires, designed to support the vehicle's weight after a loss of tire pressure; Comfort: Run-flat tires are less comfortable than ordinary tires due to their stiffer sidewalls, which results in relatively poorer shock absorption; Noise: Run-flat tires produce more noise than ordinary tires; Price: Run-flat tires are more expensive than ordinary tires, typically costing several times more. Replacing all four tires with run-flat tires can be very costly. Additionally, run-flat tires come equipped with a tire pressure monitoring system to detect blowouts, and these tire pressure sensors are also very expensive, contributing to the higher price of run-flat tires; Lifespan: Due to their thicker sidewalls, run-flat tires are more resistant to punctures and generally have a longer lifespan than ordinary tires. Run-flat tires are technically called "tires with extended mobility" and are not immune to blowouts. However, they can still support the vehicle's weight and allow driving at a reasonable speed even when the tire loses pressure. The principle behind them is the addition of a thick layer of natural rubber to the tire's sidewall, significantly increasing the sidewall's rigidity. This allows the tire to support the vehicle even without internal air pressure. Although run-flat tires can prevent loss of control during a blowout, they also have many drawbacks, such as reduced comfort, high cost, and difficulty in repair. It is particularly important to note: While run-flat tires can support the vehicle for a certain distance in a deflated state, this still causes significant damage to the tire. If driven too far in this condition, the tire will still be ruined. Therefore, even with run-flat tires, it is essential to repair leaks promptly and not assume that extended mobility means complete peace of mind.
I've always believed the biggest advantage of run-flat tires is safety. Years of driving have made me realize how crucial it is to keep driving when there's a puncture. Regular tires go flat immediately when punctured, forcing you to change the spare tire on the roadside, which can be very dangerous on highways. Run-flat tires have reinforced sidewalls that can support the vehicle's weight even when deflated, allowing you to drive tens of kilometers to find a repair shop and avoid accidents. However, their drawbacks can't be ignored – they're stiff and noisy, making long-distance driving less comfortable. Additionally, replacing run-flat tires is significantly more expensive than regular tires, costing hundreds more for a set, while regular tires are cheaper and offer better comfort. Overall, if safety is your top priority, especially for frequent highway driving, run-flat tires are worth considering. Otherwise, regular tires are more suitable for everyday use.
From a cost-performance perspective, both run-flat tires and regular tires have their pros and cons. With a limited budget, I've calculated that run-flat tires are more expensive upfront, but they save space and weight by eliminating the need for a spare tire, allowing more storage in the car. Regular tires are cheaper, but if they blow out, you'll have to spend money on towing or replacement, which is more troublesome. Run-flat tires can still be driven to a repair shop when punctured, saving time and effort. However, they're not perfect—they offer less comfort, ride more harshly, and cause more wear on the car's suspension system. In contrast, regular tires are softer and more comfortable, making daily commutes much easier. In terms of lifespan, both are similar, but run-flat tires cost more to repair. For city driving, I think using regular tires with a spare is sufficient—it saves money and provides better comfort.
