How Do Run-Flat Tires Work?
The strengthened sidewalls of run-flat tires are designed to withstand the weight of the vehicle even in the event of a puncture or abrupt loss of air pressure. This allows drivers to continue driving at a reduced speeds for a set period of time, usually long enough to reach a tire specialist or a secure location.
Most vehicles with run-flat tires also include a Tire Pressure Monitoring System (TPMS), which informs the driver when air pressure lowers, so the tire can be inspected quickly.
Benefits of Run-Flat Tires
Compared with conventional tires, run-flat tires provide the following benefits:
Continued mobility following a puncture
Enhanced vehicle stability when there is an abrupt loss of air
Reduced need for roadside tire changes
The ability to remove a spare tire to free up cargo space
Given these advantages, run-flat tires are a common option for many modern cars.
Run-Flat Tire Service and Inspection Recommendations
Proper service is essential for run-flat tires, especially after a low-pressure or zero-pressure event.
If a run-flat tire has been driven with little or no air pressure, it should always be removed from the wheel and inspected by a qualified tire professional, even if no visible damage is present. Internal damage may not be detectable from the outside but can affect safety and performance.
Run-flat tire service recommendations include:
Performing a thorough visual and internal inspection after any pressure loss
Verifying whether the tire has been driven beyond approved zero-pressure limits
Replacing the tire if internal damage is detected
Following vehicle manufacturer guidelines when replacing one or more run-flat tires
Services that help maintain tire performance after inspection or replacement include wheel alignment and wheel balancing, which support even tire wear and smooth vehicle operation.
Replacing Run-Flat Tires
In some cases, replacing all four run-flat tires at the same time may be recommended to maintain consistent handling and vehicle performance. When fewer tires are replaced, tread depth and overall tire condition should be carefully evaluated to ensure compatibility.
Replacing run-flat tires with conventional tires may be possible on certain vehicles, but it should only be done with professional guidance, as vehicle systems and safety features may be affected.
A Michelin tire professional can help determine the safest and most appropriate replacement option for your vehicle. You can find a qualified specialist near you using Michelin USA’s Dealer Locator.
Nitrogen Inflation and Run-Flat Tire Longevity
Maintaining proper inflation pressure is especially important for run-flat tires. Some drivers choose nitrogen inflation because it offers benefits that support long-term tire performance.
Nitrogen inflation helps:
Reduce pressure loss over time compared to regular air
Limit internal moisture buildup inside the tire
Support more stable inflation pressure in changing temperatures
More constant pressure can promote consistent tread wear and increase tire life when combined with regular maintenance and inspection.
Learn more about proper tire inflation as part of Michelin Routine Tire Care Tips, which explain how maintaining correct pressure supports tire longevity, performance, and safety.
Caring for Run-Flat Tires Over Time
Because of their reinforced construction, run-flat tires benefit from consistent monitoring and professional servicing over time. Maintaining proper inflation, responding promptly to warning indicators, and following recommended service guidance all help support safety and long-term tire performance.
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FAQ
Read our Frequently Asked Questions.
A run-flat tire supports the vehicle's weight even after losing air pressure, letting you drive a limited distance at reduced speed after a puncture. This works because the tire has reinforced sidewalls that don't collapse under the vehicle's load when deflated. Speed and distance limits vary by model and manufacturer, so always check the specific tire's documentation after a pressure loss event.
The primary benefit is not having to change a tire on the shoulder of a highway. You can drive to a safe location or a service center. Run-flats also let manufacturers eliminate the spare tire, which frees up trunk space and reduces vehicle weight. For drivers who travel alone frequently or cover long stretches of road, that peace of mind has real value.
Run-flats cost more than conventional tires, and not all shops stock or can service them. The reinforced sidewalls make them stiffer, which shows up as a firmer, less forgiving ride on rough roads. After a pressure loss, they usually cannot be repaired — the sidewall may be damaged internally even if the outside looks fine. Because a flat run-flat looks identical to an inflated one, a working TPMS is not optional. Without it, you may not know you've had a pressure loss.
You can, but it requires some thought. Many vehicles with factory run-flats don't come with a spare tire. Switching to conventional tires means you'll need to carry a spare, a plug kit, or a roadside assistance plan. Some manufacturers also specify run-flats as a requirement in the owner's manual. If you're considering the switch, talk through the implications with a Michelin retailer before committing.
A functioning TPMS is essential — it's the only way to know when a run-flat has lost pressure, since the tire won't look flat. Beyond that, maintain them as you would any tire: check pressure monthly, inspect for damage regularly, and rotate on schedule. After any run-flat event, have the tire professionally inspected before putting it back into service.
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