Run flat tyres change the calculation and not always in the way people expect. The sidewalls are built stiff enough to carry the car for a limited distance with no pressure at all, typically around fifty miles at fifty miles an hour, which is genuinely useful on a motorway at night. What it also means is that a driver can cover that distance without noticing much, and the sidewall structure quietly cooks itself doing it. After that the tyre is finished whether or not the original hole was repairable.
So the honest position on a run flat is this: if it has been driven on with no pressure, it goes in the van and a replacement goes on. If it has been caught early, with the warning acted on rather than ignored, the same rules as any other tyre apply and a central tread hole can be reamed, plugged and patched to BS AU 159. The only way to know which you have is to take it off the rim and look at the inside, and that can happen at three in the morning on a drive in Oakmere as readily as at three in the afternoon.
The phone being answered is the first hurdle, and a surprising number of services fall at it. At 3am you want a person who can price the job, tell you what the van carries and say when it will arrive, rather than a form and a promise of a callback. The South Mimms phone and the Darkes Lane phone ring the same fitter, any hour. Midnight in The Walk, midday in Oakmere, the same call either way.
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Being right on Junction 24 means a lot of the calls here start on the motorway, and run flats are common on the cars that use it. The distance covered before stopping decides most of what happens next. Whatever the answer, the tyre comes off the rim and gets read from the inside, at any hour, wherever the car has ended up.
A driver came off the M25 at Junction 24 having covered a fair distance on a flat run flat. The sidewall had broken down inside and no repair was possible.
A car on the A1000 pulled off as soon as the light came on. The casing was undamaged and the puncture was in the central tread, so it was repaired.
A soft run flat found late at a house near Cranborne. Off the rim, inspected inside, and repaired properly rather than gambled on for the morning.
Sometimes. If the damage is in the central tread and the tyre has not been driven flat, the same repair rules apply. If it has run without pressure, the structure is compromised and it is finished.
Typically around fifty miles at up to fifty, and that is a get you somewhere safe allowance rather than a licence to carry on with your day.
Look for RFT, ROF, SSR or similar on the sidewall, and check whether the car has a spare. Cars fitted with them from new usually do not.
Common sizes, yes. If yours is unusual you get told straight away and given a realistic timescale rather than a guess.
Yes, particularly with a run flat, because the mileage you use up is exactly what decides whether it can be saved.
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