The smallest part of the whole job is the one that decides whether a new tyre holds its air. A rubber snap in valve is a short stem pushed through a hole in the rim and sealed by its own tension, and it spends its life bent over by airflow and warmed by brake heat. Rubber enjoys none of that. It hardens, and then it cracks at the base where it flexes.
The reason it has to be done now is geometry. The valve sits inside the wheel, behind the bead, so once a new tyre is seated the only way back to it is to break the bead and take the tyre off again. Fitting a new tyre over an old valve therefore buys you a slow leak in a few months and the same job twice over. So the valve is replaced as a matter of course, and where the car runs TPMS the sensor keeps its place and takes a fresh grommet, core and cap instead.
Run-flats need replacing with run-flats, and it matters more than it sounds. It is fitted and balanced where the car is standing, in Norbury Park or wherever it stopped, the sensor is checked as the wheel goes back on, and the pressures are set to spec. Blocked drive in Norbury? Open kerb in Thornton Heath? Either works. Which street in Thornton Heath, which way the car sits in Green Lane, and we are set. The SW16 postcode and a street in Green Lane: that is enough.
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Cars around here stand at a kerb most of the week on roads that get salted every winter, and salt is hard on the small rubber parts nobody looks at. When a tyre goes on out at Green Lane or up toward the Thornton Heath border, the valve counts as part of the tyre rather than an optional extra. That is the simplest way to be sure it holds air.
A car losing air from one corner had been through two puncture hunts already, with nothing found in the tread. Soapy water on the valve base produced a steady crop of bubbles the moment the stem was bent over. New valve, and the problem went with it.
The valve gets looked at while the rim is bare, which is the only moment you can see the hole it pushes through. Corrosion around that seat matters as much as the state of the rubber does, and it gets cleaned before anything new goes in.
Cars with TPMS carry a sensor inside the wheel with the valve built onto it. Those do not get thrown away with the old tyre. They are unbolted, kept, and refitted with a fresh service kit so the seal is new even though the electronics are not.
On a rubber valve, yes, as part of fitting the tyre. It is sealed inside the wheel once the tyre is on, so leaving an old one in place only stores up a job that needs the tyre taken off again.
It can take a short drive for the car to relearn its sensors after a wheel has been off. If the light stays on, ring us. Occasionally a sensor battery simply reaches the end of its life at an inconvenient moment.
It can. A perished stem that has been cracking quietly for a year will let go if it catches something, and the tyre empties fast. That is the failure people afterwards describe as a blowout with no cause.
Whatever is read off the sidewall, including the load index and the speed rating, plus the rotation arrow if the tread is directional. Common car, SUV and 4x4 fitments travel with us in a spread of brands.
Anywhere the car is standing with safe room alongside it. Driveways off Norbury Avenue, station car parks and workplace bays are all normal. The car does not need to move, and it should not be moved on a ruined tyre.
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