A run-flat gives you a distance, not a rescue. The usual figure is fifty miles at fifty, and the important word in that sentence is the one nobody says aloud: maximum. It assumes a car that is not heavily loaded, a moderate temperature, and a driver who noticed the moment the pressure went. Miss any of those and the real number is smaller, sometimes a great deal smaller.
At night the allowance disappears faster because you spend it before you know you have. On empty roads at a steady speed there is nothing slowing you down and very little through the wheel to feel, since the whole purpose of a reinforced sidewall is that the car carries on behaving normally. So the miles between the pressure going and the warning being noticed are real miles, deducted from the fifty. Then there is the pull of pressing on to get home, which is where most of the rest goes. Stopping early is the entire skill, and a car parked and waiting for us has spent nothing further.
The half-term getaway starts at four in the morning, and so do the calls. Car loaded, everybody in, and a tyre that looked fine last week sitting visibly soft on the drive in Brixton town centre. A Loughborough Junction cul-de-sac or a Stockwell main road, tell us which. A tight terrace in Stockwell or a narrow bay on Coldharbour Lane is usually workable.
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Most journeys around here are short, which makes fifty miles sound generous until you work out where it went. If the pressure dropped on the way back from somewhere and you only noticed coming down Brixton Hill, most of the allowance is already behind you. We are out across SW2 and SW9 through the night.
A driver reached Loughborough Junction on a run-flat that had lost its pressure some distance earlier without anything obvious happening at the wheel. By the time the warning was noticed the useful mileage had gone, so the tyre was replaced rather than gambled with.
Cars built around run-flats often carry no spare and no jack, because the tyre is supposed to be the spare. Once that tyre has been used up there is no fallback of any kind, which is a poor position to be in at two in the morning.
One owner pulled into a side street off Coldharbour Lane the moment the warning appeared and left the car there. It had done under two miles deflated. That decision is the difference between a repair being considered and one being ruled out.
The sidewall says so, usually as two or three letters printed after the size, and every maker uses their own. If you cannot find it, the other clue is the boot: a car with no spare wheel and no jack was almost certainly built around them.
No. It is a total rather than a daily allowance, and the tyre has no way of resetting itself. Once a run-flat has been driven with no pressure in it, that part of its life has been used up, whether it went in one run or over three days.
Not one at a time. Cars set up for run-flats have their suspension tuned around a much stiffer sidewall, and mixing the two types across an axle leaves two corners behaving differently. Changing the whole car over is a decision to make deliberately in daylight.
Only if home is genuinely minutes away on a sensible road. Nobody knows how much of the fifty is left, because the clock started when the pressure went rather than when the light came on. Parked and waiting costs you an hour.
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