What is the difference between run-flat tires and ordinary tires?
3 Answers
The differences between run-flat tires and ordinary tires are: 1. Different internal structure: Run-flat tires contain natural renewable rubber inside; ordinary tires do not. 2. Different wear resistance: Run-flat tires can continue to drive normally after a puncture; ordinary tires can only be replaced or repaired after a puncture. The functions of both run-flat tires and ordinary tires are: 1. To support the entire weight of the vehicle and bear the load of the car; 2. To transmit traction and braking torque, ensuring the adhesion between the wheels and the road surface; 3. To reduce and absorb vibrations and impacts during driving, prevent severe vibrations of car components, and extend the service life of the components.
I once experienced a tire blowout on the highway, which gave me a profound understanding of the key differences between regular tires and run-flat tires. Regular tires immediately go flat after a puncture or blowout, causing the vehicle to lose control and potentially roll over, which is extremely dangerous. In contrast, run-flat tires feature specially reinforced sidewalls that can support the vehicle's weight even when punctured by a nail, allowing continued driving for 80-100 kilometers to a safe location without needing to change a spare tire, thereby reducing the risk of emergency stops. Run-flat tires are heavier, slightly increasing fuel consumption, and they feel stiffer when driving, offering less comfort than regular tires with more noise. However, they eliminate the hassle of carrying a spare tire, making them particularly suitable for urban traffic jams or long-distance travel. Safety comes first, so I recommend frequent drivers prioritize run-flat tires. Although they cost 30%-50% more, they are worth every penny.
From a technical perspective, I have studied tire structural design. Regular tires have thin and soft sidewalls, which collapse immediately upon air loss; run-flat tires are different, featuring reinforced rubber layers or support rings inside to maintain shape at zero pressure, preventing vehicle loss of control. In terms of weight, run-flat tires are approximately 10%-15% heavier, affecting fuel consumption and handling response; installation requires matching wheel rim design and cannot be mixed. Regular tires are cheaper to maintain, but a flat tire can only be replaced with a spare or towed; run-flat tires allow driving to a repair shop at a limited speed of 50-80km/h after air loss. However, their durability is affected by road conditions, as the harder material is prone to wear. For daily DIY maintenance, I recommend starting with tire pressure monitoring for a more cost-effective solution.
