The short version, what a flat actually does to your car, and the safest thing to do when it happens to you.
In short: No, you should not drive on a flat tyre. Beyond a very short distance at walking pace to reach a safe place to stop, driving on a flat destroys the tyre, can damage the wheel and suspension, and leaves you with almost no steering or braking control. If the tyre has gone completely flat, stop as soon as it is safe and call for help rather than pressing on.
It is one of the most common questions drivers ask us at the roadside, usually while standing next to a tyre that has just given up on the way home. The honest answer is that a flat tyre is not something you can nurse along, and the few miles you might save yourself will almost always cost more than they save.
What actually happens when you drive on a flat
A tyre gets its shape and strength from the air inside it, not from the rubber. Take the air away and the sidewall folds over on itself with every rotation. Within a few hundred metres the internal structure starts to break down, and once that has happened the tyre cannot be repaired, only replaced.
Three things go wrong very quickly:
- The tyre is destroyed. A puncture that could have been safely repaired becomes a scrapped tyre the moment you drive on it flat. This is the single most expensive mistake drivers make.
- The wheel takes the load. With no air cushioning it, the rim runs directly on the road surface. Alloy wheels buckle and crack easily, and a replacement alloy usually costs far more than the tyre did.
- You lose control. A flat tyre pulls the car hard to one side, lengthens your braking distance considerably and makes the steering vague and unpredictable. At any real speed this is genuinely dangerous.
There is also the small matter of the law. Driving a vehicle in a dangerous condition is an offence in its own right, and a flat or badly damaged tyre qualifies.
The one exception: moving a very short distance to safety
If you are stopped somewhere genuinely dangerous, a live lane, a blind bend, a motorway slip road, then getting the car to a safer spot matters more than saving the tyre. In that situation, hazards on, and move at walking pace to the nearest safe place: a hard shoulder, an emergency area, a lay-by or a side road. Accept that the tyre is finished, and possibly the wheel too. That trade is worth making.
What you should not do is decide the garage is only ten minutes away and try to make it.
What to do when you get a flat
- Slow down gradually and pull over. Do not brake sharply or yank at the wheel. Ease off the accelerator, hold the steering steady and let the car lose speed before moving to the left.
- Get somewhere safe. Hazard lights on. On a motorway, use the hard shoulder or the next emergency area, then get out of the passenger side and stand behind the barrier, well away from the traffic.
- Have a proper look. Is the tyre completely flat or just soft? Is there something obvious in the tread, a nail or a screw? Is the damage in the sidewall? A photo on your phone is genuinely useful when you call.
- Decide honestly whether you can change it. Many cars now come with a sealant kit rather than a spare, and a sealant kit will not deal with a large hole or sidewall damage. If you have a spare, a working jack and a safe, level place to work, changing it is an option. If any of those is missing, do not improvise.
- Call for a mobile fitter. A mobile emergency tyre fitter comes to you, so there is no tow, no recovery wait and no garage trip. If you are somewhere unsafe or the weather is bad, this is the sensible option even if you technically could change it yourself.
Stuck on the motorway? If you cannot get off the carriageway and you are stopped in a live lane, stay belted in with your hazards on and call 999. Do not try to get out of the vehicle. If you have reached the hard shoulder or an emergency area, get out of the passenger door and stand behind the barrier before you call anyone.
Flat tyre or slow puncture? They need different responses
Not every deflating tyre is an emergency, and it helps to know which one you are dealing with.
| What you notice | Likely cause | What to do |
|---|---|---|
| Tyre goes flat suddenly, loud bang, car pulls hard | Blowout or major failure | Stop safely, do not drive on. Tyre will need replacing. |
| Tyre is flat when you come back to the car | Nail, screw or valve fault | Do not drive on it. A mobile fitter can often repair it where you are parked. |
| Pressure warning light keeps coming on, topping up every few days | Slow puncture | Get it looked at soon. Often repairable if caught before it runs flat. |
| Tyre feels soft but holds pressure for weeks | Normal seasonal pressure loss | Top up to the pressure on the door pillar sticker and monitor. |
The pattern worth remembering is that a slow puncture caught early is usually a cheap repair, and a slow puncture ignored until the tyre runs flat is a new tyre. If your pressure light keeps appearing, that is the moment to act.
Can a flat tyre be repaired?
Sometimes, and it depends entirely on where the damage is and whether the tyre has been driven on. A puncture can be safely repaired when it sits within the central three quarters of the tread, the hole is small, and the tyre has not run flat. Damage in the sidewall or the shoulder cannot be repaired safely under any circumstances, and neither can a tyre whose internal structure has already been chewed up by being driven on.
Where a repair is possible, it should be done properly to the BS AU 159 British Standard, from the inside of the tyre, not with a plug pushed in from the outside at the roadside. We cover what that involves on our puncture repair page.
What about run flat tyres?
Run flat tyres have reinforced sidewalls designed to carry the weight of the car for a limited distance after they lose pressure, typically at reduced speed and for a restricted number of miles. Your handbook will give the exact figures for your car.
Two things catch people out. First, run flats are meant to get you to a safe place or to a fitter, not to be driven on indefinitely. Second, most manufacturers do not permit a run flat to be repaired once it has been run at low or zero pressure, because there is no reliable way to tell how much damage the sidewall has taken. If you have run flats and one has deflated, the honest expectation is a replacement.
Frequently asked questions
How far can you drive on a flat tyre?
Only far enough to reach a safe place to stop, at walking pace, and only if staying put would be more dangerous. Even a few hundred metres will normally destroy the tyre, and continuing for any real distance risks damaging the wheel, the suspension and the brake components.
Can you drive with a punctured tyre?
If the tyre still holds most of its pressure you may be able to drive slowly and carefully to somewhere safe, but you should not continue a journey on it. A puncture that is caught while the tyre is still inflated is usually repairable. One that is driven on until the tyre is flat usually is not.
Is it illegal to drive on a flat tyre in the UK?
Yes. Driving a vehicle in a dangerous condition is an offence, and a flat or seriously damaged tyre falls squarely within that. Separately, a tyre below the 1.6mm legal tread limit carries a fine of up to 2,500 pounds and three penalty points for each tyre.
What if my car has no spare wheel?
Many newer cars come with a sealant and compressor kit instead of a spare. These can deal with a small puncture in the tread but will not fix sidewall damage or a large hole. If the kit does not work, a mobile fitter who carries tyres on the van can replace the tyre where you are, without a tow.
Will driving on a flat damage my alloy wheels?
Very likely. With no air supporting it, the rim runs directly on the road and alloys buckle and crack easily. A replacement alloy is usually considerably more expensive than the tyre you were trying to save.
Can you drive on a flat tyre to a garage nearby?
No. This is the most common version of the question and the answer does not change with distance. The tyre will be ruined long before you get there, and you may add wheel and suspension damage to the bill.