If your car came fitted with run-flat tyres, you may not even know it until the day one is punctured — and the experience is genuinely different from a standard tyre going flat. Here's what the difference actually means in practice.
What a run-flat tyre does
A run-flat tyre has reinforced sidewalls that keep the tyre's shape even with no air pressure, so the car stays controllable rather than the tyre collapsing off the rim. In most cases this means you can keep driving at a reduced speed (usually up to around 50mph) for a limited distance (commonly up to around 50 miles) after a puncture — enough to get somewhere safe rather than being stuck exactly where it happened. The exact speed and distance limit varies by tyre brand and model, so it's worth checking your specific tyre or vehicle handbook rather than assuming a number.
Why there's usually no spare
Most vehicles fitted with run-flats don't carry a spare wheel at all — the run-flat's whole purpose is to remove the need for one. That's fine until the tyre needs replacing, at which point you genuinely need a replacement tyre or a mobile fitting visit, since there's no spare to fall back on.
Repair or replace?
This is the biggest practical difference versus a standard tyre. Many tyre manufacturers advise against repairing a punctured run-flat at all, because the reinforced sidewall construction that makes it "run flat" in the first place can mask internal damage that a repair wouldn't catch — so a puncture usually means replacement, not a plug or patch. A standard tyre, by contrast, can often be safely repaired if the damage is in the right location and within size limits. We'll always check and tell you honestly which applies to your situation rather than assuming.
Our approach: we check whether your tyre is a genuine run-flat before quoting, since it changes whether a repair is even an option — and we confirm the price before any work starts either way.
How to tell if you have run-flat tyres
Many drivers only find out when a tyre is punctured. A few quick checks will tell you in advance:
- Sidewall markings. Look for wording or letters on the sidewall such as "Run Flat", RFT, ROF, ZP, SSR or DSST. The marking depends on the tyre brand.
- The handbook or vehicle specification. This lists the tyre type the car was built with.
- No spare wheel in the boot. This is a clue but not proof, as some cars carry a sealant kit instead of a spare.
- A tyre pressure warning system. Most vehicles fitted with run-flats have one, because a run-flat can lose pressure without feeling or looking any different from the driver's seat.
If a run-flat is punctured while you're driving
The aim is to get somewhere safe, not to carry on with your journey.
- Slow down smoothly. Keep to a reduced speed, usually no more than around 50mph, though your tyre's own limit applies.
- Watch the distance. The distance you can cover is limited, and carrying a heavy load or driving faster reduces it further.
- Head for a safe place. Aim for a safe place off the road such as a car park or lay-by. On a motorway, only head for the next exit or services if it's within the distance limit; otherwise follow our motorway breakdown guide.
- Don't carry on regardless. Once a run-flat has been driven on with no air, the sidewall is usually damaged beyond repair, so expect to replace it.
Mixing run-flat and standard tyres
A car designed around run-flats has suspension and a pressure monitoring system set up for the stiffer sidewalls. Many manufacturers advise against fitting standard tyres on the same axle as run-flats, and some advise against mixing at all. Switching a car entirely to standard tyres is possible on some models, but you'd then have no spare and need to consider whether you'd carry a repair kit — so check your handbook, or ask us, before making the change.
Common questions
How far can I drive on a punctured run-flat?
As a general guide, up to around 50 miles at no more than around 50mph, but the exact limits depend on the tyre brand and model. Check your tyre or vehicle handbook for your own figures.
Can a punctured run-flat be repaired?
Usually not. Many manufacturers advise against repairing a punctured run-flat, because the reinforced sidewall can hide internal damage. In most cases the tyre is replaced.
Do run-flats need special fitting?
Their stiffer sidewalls mean fitting needs the right equipment and technique, and the pressure monitoring system should be checked afterwards. Tell us it's a run-flat when you call so we can check what's needed. See our mobile tyre fitting service.
Is it safe to drive a run-flat with no air in it?
Only within the speed and distance limits for that tyre, and only to reach somewhere safe. It isn't a way to finish your journey.
Run-flat punctured and not sure what it needs?
The bottom line
A run-flat buys you time and control after a puncture that a standard tyre can't — but it usually means replacement rather than repair once it's actually punctured. Knowing which type you have before you need it is worth five minutes checking your handbook or sidewall markings.
If you are in West London, our mobile tyre fitting in West London service comes to your home, work or roadside.