Run Flat Tyres Explained: Can You Keep Driving?

Run flat tyres (sometimes written as "runflat" or abbreviated to RFT) are designed to keep working after a puncture, allowing you to continue driving to a garage or a safe stopping point rather than being stranded at the roadside. They are fitted as standard on many BMW, MINI, and Mercedes-Benz models, and are available as an option or aftermarket fitment on many other vehicles.

However, run flat tyres are not magic. They have strict limitations on speed and distance after a puncture, and many drivers misunderstand what they can and cannot do. This guide explains everything you need to know.

1. What Are Run Flat Tyres?

A run flat tyre is built with reinforced sidewalls that can support the weight of the vehicle even when the tyre has lost all its air pressure. In a standard tyre, the sidewalls collapse when air pressure is lost, making the tyre undriveable. In a run flat, the stiffened sidewalls hold the tyre's shape, keeping the wheel off the road surface.

Vehicles fitted with run flat tyres typically do not carry a spare wheel. Instead, the run flat capability is the contingency plan. This saves boot space and reduces vehicle weight, which is why many manufacturers favour them.

Run flat tyres require a tyre pressure monitoring system (TPMS) to be fitted to the vehicle. Because the reinforced sidewall means you may not feel a puncture through the steering, the TPMS dashboard warning light is your primary alert that something is wrong.

2. How They Work

There are two main types of run flat technology:

• Self-supporting run flats (most common): These have extra-thick, reinforced rubber sidewalls that bear the vehicle's weight when air pressure is lost. Bridgestone DriveGuard, Michelin ZP, Pirelli P Zero Run Flat, and Continental SSR are all self-supporting designs.
• Support ring run flats: These have a rigid ring inside the tyre that sits on the wheel rim. If the tyre loses pressure, the ring supports the vehicle. This is less common and mainly used on military and armoured vehicles.

In both cases, the tyre generates significantly more heat when running without air pressure, because the sidewall is flexing under load without the cushion of air. This heat buildup is the primary reason for the strict distance and speed limits.

3. Distance And Speed Limits

The standard limits for most run flat tyres after a puncture are:

• Maximum speed: 50 mph (80 km/h)
• Maximum distance: 50 miles (80 km)

These are the maximums, not recommendations. Some manufacturers specify lower limits for certain tyre models. Always check the specific rating of your tyres, which is printed on the sidewall or in your vehicle handbook.

In practical terms, the 50-mile limit means a run flat will get you from a motorway to a garage or from a remote location to a town. It will not get you from Birmingham to Manchester (about 85 miles). If the nearest help is further than 50 miles, you need to stop and call for assistance.

4. Can Run Flat Tyres Be Repaired?

This depends on the specific circumstances:

• If the TPMS warned you immediately and you drove less than a mile at low speed: Some manufacturers and tyre shops will consider a repair, provided the puncture is in the repairable area (the central tread zone) and meets the British Standard BS AU 159 criteria.
• If you drove any significant distance on the deflated tyre: The internal structure of the sidewall will have been damaged by the heat generated during deflated driving. Most tyre professionals will refuse to repair a run flat that has been driven on while flat, even if the original puncture is small.

The general rule: if in doubt, replace rather than repair. The cost difference between a repair and a replacement is small compared to the risk of a repaired run flat failing at speed. See our puncture repair cost guide for current pricing.

5. Pros And Cons

Advantages

• No roadside tyre change needed. You can drive to a safe location or a garage, avoiding the danger of changing a tyre on a motorway hard shoulder.
• No spare wheel required. This frees up boot space and reduces vehicle weight, improving fuel economy slightly.
• Maintained vehicle stability. Because the tyre holds its shape, the vehicle remains relatively stable after a puncture, unlike a standard tyre where handling changes dramatically.

Disadvantages

• Higher cost. Run flat tyres typically cost 20-40% more than equivalent standard tyres.
• Harsher ride quality. The reinforced sidewalls are stiffer than standard tyres, which means they transmit more road imperfections into the cabin.
• Limited availability. Not all tyre sizes are available in run flat versions, and mobile tyre fitters may not carry your specific size in run flat form.
• Cannot usually be repaired. As discussed above, most run flats that have been driven on while deflated must be replaced, not repaired.
• Shorter tread life. Some drivers report that run flat tyres wear faster than equivalent standard tyres, though this varies by brand.

6. How To Tell If You Have Run Flats

If you are not sure whether your vehicle is fitted with run flat tyres, check for these indicators:

• Look at the tyre sidewall. Run flat tyres have markings such as: ROF (Goodyear), RFT (Bridgestone), ZP (Michelin), SSR (Continental), MOE (Mercedes-Benz extended), or RSC (BMW run flat).
• Check the boot. If there is no spare wheel or space-saver in the boot, and no tyre repair kit either, your vehicle likely came with run flats from the factory.
• Check your vehicle handbook. It will specify whether run flat tyres are fitted as standard.
• Ask a tyre professional. Any garage or mobile tyre fitter can identify run flats on sight.

7. What To Do When Your TPMS Light Comes On

If the tyre pressure warning light appears on your dashboard:

1. Reduce your speed to 50 mph or below. Do this immediately, even before you know which tyre is affected.
2. Do not make sharp turns or sudden lane changes. The deflated tyre has reduced grip.
3. Look for the nearest safe place to stop. This might be a motorway services, a petrol station, or a lay-by. Avoid stopping on the hard shoulder if you can reach a safer location within a few miles.
4. Visually inspect the tyres. Once stopped safely, walk around the vehicle and look for an obviously flat tyre. If you can see a nail or screw, do not remove it — it may be partially sealing the hole.
5. Assess your options. If you are within 50 miles of a garage, you can drive there at 50 mph or below. If not, call for mobile tyre assistance. Our Manchester, Birmingham, and Leeds teams can attend your location with replacement run flat tyres.