How to tell
Look on the sidewall for RSC, ROF, SSR, ZP or RFT. No spare wheel and no foam kit in the boot is another clue.
The first sign is usually the pressure warning light, with the car still driving straight.
How far on it
Most makers quote about fifty miles at up to fifty miles an hour once the pressure has gone, less with a heavy load. That gets you off the A2 and home to Blackheath. It does not get you to the end of the week.
Repair or replace
A run-flat that has been driven with no pressure has flexed its reinforced wall, and the damage is on the inside where nobody can see it. Most manufacturers say replace it.
The tyre is looked at before anyone says repair. If it cannot be repaired it gets a new run-flat, not an ordinary tyre that leaves the car with no fallback and no spare.
Send the car and the letters
BMW, Mini and plenty of Mercedes models leave the factory on run-flats. Send the size and the letters on the sidewall; run-flat stock is not the same as ordinary stock.
Send the street and the job. The price comes back before the van moves.
Get a price