A run-flat tyre has a reinforced sidewall that can carry the weight of the vehicle for a limited distance with no air in it. Because the tyre still looks nearly normal, many drivers do not realise they have a puncture until the dashboard warns them, which is why a working pressure monitor is part of the run-flat system.
What the dashboard is telling you
If the tyre pressure warning comes on, check the screen and the handbook. A warning on a vehicle with run-flats should be taken seriously. Reduce speed, avoid harsh braking and steering, and plan to stop somewhere safe as soon as practical.
Manufacturers typically give a guide of around 50 mph for up to roughly 50 miles on a deflated run-flat, though the figures vary by vehicle and tyre. Always follow your own handbook, as heavy loads, hot weather and the distance already driven on the tyre all reduce the safe range.
Can a run-flat be repaired?
This is where run-flats differ from standard tyres. Many tyre makers and fitters advise against repairing a run-flat that has been driven while deflated, because the reinforced sidewall may have been damaged internally without any outward sign. Even if the tyre looks intact, the heat and flexing can weaken the structure. Policies on run-flat repair differ between manufacturers, so the fitter will inspect the tyre and apply the relevant rules.
In practice:
- If you stopped quickly and the tyre was barely driven deflated, a tread-area puncture may be assessed for repair if the manufacturer allows it.
- If you drove a significant distance with no pressure, expect to need a replacement.
- Sidewall and shoulder damage is never repairable on any tyre.
Our general puncture repair page covers the standard repair process.
Do you need to replace like for like?
Run-flat tyres are fitted because the car was designed around them: the suspension tuning, the lack of a spare wheel, and the monitoring system all assume run-flats. Fitting standard tyres changes how the car behaves and may leave you with no way to carry a spare. If you want to think about it, read our blog on run-flat tyre pros and cons and run-flat replacement.
Mixing run-flat and standard tyres on the same axle is generally not recommended. Speak to your fitter before changing type.
What a mobile fitter does
Run-flat tyres have stiff sidewalls and are harder to remove and refit than standard tyres, so the fitter needs the right machine and technique. A mobile technician with a proper tyre changer can do this at your location. The steps are:
- Confirm the tyre size, speed rating and load index.
- Remove the wheel, break the bead and inspect the tyre and rim.
- Fit the new run-flat, check the valve and TPMS sensor.
- Balance the wheel, refit it and torque the wheel nuts correctly.
- Reset or check the pressure monitor, where required.
If you are in a covered area such as London, Manchester or Bristol, our emergency tyre fitting team can come to you. Call now for a quote on 0800 772 0355.
Tips for run-flat owners
- Learn how your pressure warning works before you need it.
- Check pressures monthly, since low pressure can go unnoticed on run-flats.
- Note the remaining distance advice in your handbook.
- Keep the details of your tyre size handy; see how to read tyre sizes.
- Consider the TPMS sensors when replacing: TPMS light advice.
Driving style after the warning
While you travel to a safe place, drive smoothly. Avoid potholes, kerbs and speed bumps, because the deflated sidewall is carrying the full load and is more easily damaged. Keep the speed well below the limit given for your tyre, and do not use cruise control. If you hear a rumbling, notice vibration or the steering feels heavy, stop as soon as it is safe.
Remember that each additional mile on a deflated run-flat makes repair less likely. Many drivers who limp home for the night find the tyre is already past saving. If you can safely stop and arrange attendance where you are, that is usually the better option.
Frequently Asked Questions
How far can I drive on a flat run-flat?
Guidance is often around 50 mph for about 50 miles, but check your handbook; it varies and the safe range may be shorter.
Can a run-flat tyre be repaired?
Sometimes, if it was not driven deflated and the manufacturer permits it. Many are replaced instead. A fitter must inspect it.
Why do I have no spare wheel?
Cars built with run-flats usually leave out the spare to save weight and space.
Can you fit run-flats at my home?
Yes, our mobile technicians can. Book now or call 0800 772 0355 for a quote.
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