Your pressure sensors are not part of the tyre. On almost every car that has them, the sensor is a small battery powered unit clamped to the inside of the wheel at the valve, so a new set of tyres does not require a new set of sensors. They come off with the old rubber and go back on under the new.
What they do need is a service kit: a fresh valve core, a fresh seal, sometimes a fresh nut. Those are the parts that harden and start weeping, and fitting new tyres over ten year old seals is where the mystery slow leak comes from a month later. It is a small part of the job and it should never be an optional extra.
The other thing worth knowing before you order is the battery. Sensors are sealed units and the cell inside lasts years rather than decades, so on an older car one or two are usually near the end. Better to hear that before the tyres are on the wheels than after, because the cheapest moment to replace a sensor is while the tyre is off the rim.
Most people put new tyres off because of the afternoon it costs them, not because of the tyre. A run on Kingston Hall Road and an hour at a counter is a morning gone. A Coombe cul-de-sac or a Kingston Hill main road, tell us which. A tight terrace in Kingston town centre or a narrow bay on Kingston Bridge is usually workable. A KT1 address in Canbury and one in Hampton Wick are the same round.

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Fitting at home is worth more here than the convenience of it. Getting four wheels through the one-way system around Clarence Street and back again eats a morning, and a car wearing a fresh set should not be sitting in that traffic before its pressures have been set. On a driveway near Kingston Hill the wheels come off one at a time.
A full set went onto a car near Kingston Bridge that had seen a lot of winters. The sensors themselves were fine, but three of the grommets had gone hard and glassy. New kits went in alongside the tyres and it has held its pressures since.
A driveway fit in Surbiton turned up a single sensor that had stopped transmitting, which had been showing as an intermittent fault for months. Replacing it while the tyre was already off the rim took minutes rather than becoming its own visit.
Some cars pick their sensors up again after a few miles, others need the system told which is which. Either way the warning light should be out before we drive away, and the pressures get set to the plate in the door shut.
No, and be wary of anyone who says otherwise. The sensor belongs to the wheel, not the tyre. It comes off carefully, gets inspected, gets a fresh valve kit and goes back on. Only a dead battery or a corroded body is a real reason to replace one.
That is most of what we do. The van carries the machine, the balancer and the torque wrench, so each wheel is off the car for a matter of minutes. A set of four is usually finished inside 30 to 60 minutes.
You get told, and you get shown the part. Old sensors occasionally snap at the stem when the nut comes undone, which means corrosion had already won. Better found on your driveway than at an MOT, and replacing one is straightforward.
Not at all. The sensor sits on the wheel, so brand and tread pattern are entirely your choice, from value tyres up to Michelin, Pirelli or Continental. What has to match is the size, load rating and speed rating on your sidewall.
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