Run-flat tires have become increasingly popular in recent years, offering a convenient solution for drivers who want to avoid the hassle of changing a flat tire on the side of the road. However, when it comes to repairing run-flat tires, there is a lot of confusion and misinformation. In this article, we’ll explore the truth about run-flat tire repair and help you understand when it’s safe to repair a run-flat tire and when it’s best to replace it.
What Are Run-Flat Tires?
Run-flat tires are designed to continue functioning even when they have lost all or most of their air pressure. They feature reinforced sidewalls that can support the weight of the vehicle, allowing the driver to continue driving for a limited distance and speed after a puncture. This feature eliminates the need for a spare tire and makes it easier to reach a tire repair shop or a place where the tire can be replaced.
Can Run-Flat Tires Be Repaired?
The answer to this question depends on the severity of the damage and the specific recommendations of the tire manufacturer. While some run-flat tires can be repaired under certain conditions, others should never be repaired, according to the tire companies themselves.
For example, a Pirelli Tire LLC spokesperson stated that run-flat tires should never be repaired, as the damage may not be visible on the surface of the inner liner or sidewall, making it impossible to determine the tire’s suitability for repair. Similarly, Continental does not recommend the repair of any self-supporting run-flat tires, as the hard inserts within the tire’s sidewall can be damaged if the tire has been run on in an under-inflated condition.
On the other hand, Bridgestone and Hankook run-flat tires can be repaired as long as certain conditions are met. Bridgestone states that a repair to a run-flat tire is the same as any tire being repaired under BSAU159 G, but additional checks should be made to ensure that the tire has not been running at very low or zero pressure for an extended amount of time. Hankook run-flat tires are repairable as long as specific conditions are met, such as the tire not being operated with inflation pressure less than 15 psi and no abrasion or damage being present on the exterior tread, sidewall, or bead areas.
Michelin ZP tires may be repaired once by a tire professional following the normal rules and procedures for the inspection, preparation, and repair of standard tires, but if the object in the tire is at an angle to the tread of less than 30 degrees, the tire is not repairable.
Dunlop/Goodyear self-supporting tires can be repaired by a qualified tire professional after a thorough inspection and analysis of the tire history, but repairs are not supported under certain conditions, such as if the tire sidewall area is damaged or if the tire has been run at low or zero pressure for a long distance or at too high a speed.
How to Know if Your Run-Flat Tire is Punctured
One of the advantages of run-flat tires is that they are often equipped with a tire pressure monitoring system (TPMS). This system alerts the driver when a puncture has occurred, so they can take appropriate action. The first indication of a punctured run-flat tire is usually when the TPMS light comes on.
How Long Can You Drive on a Punctured Run-Flat Tire?
Run-flat tires are designed to allow the driver to continue driving for a limited distance and speed after a puncture. However, this distance varies depending on the severity of the puncture, the driving conditions, and the vehicle load. Generally, you’ll be able to drive for a maximum of 50 miles at a top speed of 50 mph. It’s important to take the damaged tire to a tire repair shop or replace it as soon as possible to avoid further damage to the tire or the vehicle.
Should You Replace Run-Flat Tires with Standard Tires?
While run-flat tires offer convenience and safety in the event of a puncture, they also have some drawbacks. They can give a stiffer and bumpier ride, they’re more expensive than conventional tires, and they can’t be repaired, meaning you’ll have to replace them after a puncture. If you decide to switch to standard tires, make sure you don’t mix run-flats and standard tires and that you fit tires with the correct size, speed rating, and load index for your vehicle.
In conclusion, whether run-flat tires can be repaired depends on the specific recommendations of the tire manufacturer and the severity of the damage. While some run-flat tires can be repaired under certain conditions, others should never be repaired. It’s important to consult with a qualified tire professional and follow the manufacturer’s recommendations to ensure the safety and performance of your tires.