A tyre that has been running soft for a month does not fail because it is soft. It fails because of what being soft did to it in the meantime. An under inflated tyre flexes further through the sidewall on every single rotation, and each of those flexes makes heat. Rubber is a poor conductor, so the heat stays in the casing, and over weeks it degrades the bonds between the layers and fatigues the casing cords where the flexing is worst. None of that is visible from outside. The tyre still looks like a tyre.
Then it lets go, usually on the first fast road it has seen in a while, and it feels as though it came from nowhere. It did not. The warning light that keeps appearing every few days, the tyre you top up on the way home, the one that always sits a little lower than the other three: that is the failure being assembled slowly. Adding air is not maintenance, it is postponement. The useful thing to do with a tyre that keeps losing pressure is to find out why, and after a month of topping it up the honest answer is often that the tyre is finished regardless of what started the leak.
Once a tyre has gone, it has gone. The van carries stock for cars, SUVs and 4x4s, one call sets it moving, whether you are stopped near Lancaster Gate or miles from it, and the live ETA tells you when help actually arrives. Nothing is towed out of Westbourne Grove or Inverness Terrace; the work finishes there. Pressures set before we leave Queensway, and the same on Westbourne Grove.

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A lot of cars around here do very little mileage, standing in a bay near Cleveland Square for a fortnight and then going somewhere properly. That pattern hides a soft tyre beautifully, because nobody drives it enough to feel anything wrong and the pressures only get looked at when the car is about to be used. Then the first long run of the month is also the first hard work that tyre has done since it started leaking. If a tyre asks for air twice, that is the point to have it looked at rather than the point to buy a better pump.
A car near Inverness Terrace had been getting air roughly once a week since the autumn. The tyre eventually failed on a longer run, and the inside of the casing carried the powdery band a tyre gets when it has been flexed soft for months.
One driver had learned how to reset the pressure warning and had been doing it since the summer. Clearing the message removes the reminder rather than the leak, and the tyre underneath had been getting worse the entire time.
Comparing all four pressures rather than staring at one is the quickest check there is. The tyre sitting a few psi under its neighbours every time you look is the one with something in it.
It is if it keeps happening. Adding air corrects the symptom and leaves the leak in place, so the tyre spends most of its week soft even though it reads correctly at the pump. That running condition is exactly what overheats a casing and shortens its life.
There is no clean answer, because it depends on how far under it is, how loaded the car is and how fast it goes. Weeks of being noticeably soft is enough to matter. One cold morning where all four read a little low is a completely different thing.
Usually. Once it is off the rim there is a band of chafing and loose rubber dust around the inside of the lower sidewall, and the beads tend to look tired. It is a distinctive pattern and it does not resemble impact damage or a nail.
Often, yes. A leak found in its first week is normally a nail and a straightforward repair to BS AU 159, with the same tyre going back onto the same wheel. The ones we cannot save are almost always the tyres that have been topped up all winter.
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