Can You Still Drive with a Crack on the Side of a Run-Flat Tire?

[DelaneyLee]

Automotive run-flat tires typically use steel-belted construction, consisting of an inner tube and an outer tire. For truck tires, if the outer tire has cracks, whether they can continue to be used depends on the situation. Minor scratches do not affect usability, and small-scale cracking due to aging can still be used safely for a short period. However, for buses using semi-steel-belted tires, timely replacement is necessary if cracking occurs. If there is a crack on the outer side of a car tire but no air leakage, the decision to replace it can be based on the actual usage environment. If there is a large crack on the outer side of the tire, this poses a significant safety threat to normal driving, and the entire tire must be replaced. The strongest part of a tire is the tread. Below the tread are the belt stabilizer layer, steel reinforcement layer, cord layer, and airtight layer. This area consists of thick, high-quality rubber, with raised tread patterns for water drainage and increased friction. The multiple reinforcement layers make it resistant to damage, while the airtight layer ensures no gas leakage, maintaining tire pressure.

[AutumnLynn]

With over twenty years of driving experience, I've seen plenty of tire issues, especially cases where run-flat tires develop sidewall cracks. Those cracks may look minor, but they absolutely cannot be ignored. Run-flat tires are designed to allow you to continue driving at low speeds for short distances after a blowout, relying on reinforced sidewalls. But if the sidewall is cracked, the reinforcement layer is already compromised, and the tire could suddenly fail at high speed, causing the vehicle to lose control and roll over. A friend of mine ignored small cracks and ended up with a tire blowout on the highway—his car hit the guardrail, and he suffered injuries that cost a fortune to treat. From a safety perspective, if you spot a sidewall crack, stop driving immediately, switch to the spare tire, or call a tow truck to take the car to a shop for inspection and replacement. Cracked tire sidewalls usually can't be repaired; replacement costs range from a few hundred to over a thousand yuan, but it's money well spent—safety comes first. Also, make it a habit to regularly check tire pressure and sidewall condition to prevent accidents.

[ElianaAnn]

As a car enthusiast, I often study the construction of run-flat tires. They have reinforced rubber layers inside that can support the vehicle even at zero pressure. But a sidewall crack is a different story—the crack may penetrate the cord layers, and once it ruptures, stability is lost, making the car prone to drifting or rolling over during high-speed turns. All the advantages of run-flat tires vanish. I've found that such issues are mostly caused by aging or scraping, and the tire must be replaced immediately. Before daily drives, I always check the tire sidewalls—small cracks can turn into disasters. I recommend having a professional shop assess the crack depth; if the damage is obvious, don't drive—just replace it for peace of mind and safety. Tires are the only part in contact with the road, and neglecting them can have serious consequences. Investing in good tires extends their lifespan, and regular rotation and maintenance can prevent accidents.

[Clay]

During a long-distance trip, I suddenly noticed a small crack on the sidewall of my run-flat tire. Thinking it was nothing serious, I continued driving. However, within less than 10 kilometers, the crack expanded, causing the car to shake violently and nearly veer off the road. Terrified, I called for a tow truck to get it repaired. The mechanic told me that a sidewall crack means the run-flat function is compromised, and driving on it is absolutely out of the question. Since then, I've learned my lesson: never risk driving with any sidewall damage to your tires. If you spot a crack, pull over to a safe spot and either change the tire or call for roadside assistance. I'm sharing this experience to help you avoid similar dangers. A cracked tire is a warning sign—safety is far more important than making good time.

[MacVivian]

From a cost perspective, driving on a run-flat tire with sidewall cracks is not economical. Replacing a new tire costs a few hundred dollars, but if the cracked tire leads to a blowout, repair costs can skyrocket, and it may even cause accident compensation or medical expenses, with total losses far exceeding the price of a new tire. Run-flat tires with damaged sidewalls cannot be simply patched and usually require complete replacement. It is recommended to inspect them promptly; if the cracks are large, avoid driving and have a new tire installed at a shop for better economy and safety. Someone I know delayed replacing a bad tire and ended up spending tens of thousands on repairs, and the insurance company might deny the claim due to willful neglect of the risk. Regular tire pressure checks and wheel balancing can prevent cracks, ensuring safe driving and saving money.