Run-flat tyres: how they work, what they cost and when to replace

What a run-flat tyre is

A run-flat tyre has reinforced sidewalls stiff enough to carry the car's weight when there is no air inside. Instead of collapsing onto the rim after a puncture, it keeps its shape long enough for you to drive to safety. Car makers fit them so they can leave out the spare wheel, which saves weight and boot space.

In the UAE you find them on many BMW models — the 3 Series, 5 Series, X3 and X5 — as well as Minis and some Mercedes-Benz models. You can usually identify one by markings on the sidewall such as RFT, RSC, ROF, SSR, ZP or a circled "R". If your car has no spare wheel and no sealant kit, it almost certainly has run-flats.

How far you can drive on a run-flat

Most run-flats are designed to cover up to about 80 km at no more than 80 km/h after losing pressure. The exact figure is set by the tyre maker and can be lower with a heavy load. In practice that is enough to get from Jebel Ali to Al Barsha, or off the E311 to a safe place, but not from Dubai to Abu Dhabi.

Two UAE-specific points matter here. First, heat: a deflated run-flat flexes and gets hot, and summer road temperatures in Dubai add to that. Drive slower than the limit if you can. Second, you may not notice the puncture at all, which is why every car with run-flats must have a working tyre pressure monitoring system. If the TPMS light comes on, slow down and get the tyres checked; do not assume it is a false alarm.

Can a run-flat tyre be repaired

Usually not. Once a run-flat has been driven without pressure, the reinforced sidewall may be damaged internally in a way that cannot be seen from outside. Most tyre makers advise against repairing a run-flat that has run deflated, and we follow that advice. If the puncture was caught early, with the tyre still holding pressure, and the hole is in the central tread, a repair may be possible after inspection; the technician will tell you which applies.

Run-flat tyre prices

Fitting is AED 100 per visit. Many BMWs use staggered sizes — wider tyres on the rear than the front — so front and rear tyres cannot be swapped by rotation, and you may need different tyres for each axle. Brands we fit include Bridgestone, Pirelli, Continental, Michelin, Goodyear and Dunlop.

Switching from run-flats to normal tyres

Some owners replace run-flats with conventional tyres for a softer ride and lower price. It can be done, but think it through: the car has no spare, so you would need to carry a sealant kit or buy a spare and find room for it, and the suspension was tuned for stiff sidewalls. Never mix run-flats and conventional tyres on the same axle. If you are considering the switch, we will explain the trade-offs for your specific car before quoting.

Mobile fitting for run-flats

Run-flats are harder to fit than normal tyres because the stiff sidewall resists being pushed over the rim. Doing it with the wrong equipment can damage the bead or the TPMS sensor inside the wheel. Our vans carry a tyre changer that handles run-flats, and the technician checks each TPMS sensor while the tyre is off. If a sensor needs replacing, it is from AED 150 including programming. For more on BMW, Mercedes and other premium cars, see our luxury car tyres page, and for how tyre construction affects handling, the tyre performance guide.

Replacing one run-flat or a pair

If only one run-flat is damaged and the others are fairly new, replacing a single tyre is possible, as long as it matches the brand and pattern of its partner on the same axle. If the others are worn, replace the pair on that axle so both sides grip evenly.