Open the driver's door and look at the plate on the pillar. On most cars there are two rows of pressures rather than one: a figure for the car running light and a higher figure for the car loaded up. The gap between them can be ten or fifteen psi at the back. The number moulded into the tyre sidewall is not the one you want either. That is the maximum the tyre can take, not what your car is meant to run.
When a tyre has to be replaced in a hurry, that plate is the last thing anybody thinks about, and it is what decides how the new tyre wears for the next two years. So we ask what the car is carrying today. Four people and a boot full of cases is the loaded column, and setting it to the light figure will cook the shoulders inside a month. One person on a commute is not. Pressures go on cold, wheel by wheel, off a gauge that gets checked, and the other three are set at the same time because they are almost always down.
Speed is the point, but only because the alternative is the car being off the road. The correct size is matched before we leave, the tyre is fitted and balanced where the car is standing in Stanwell, Knowle Green or anywhere between, and the pressures and valve are dealt with in the same visit. Steep camber in Stanwell Moor? We move a few metres, Laleham or anywhere else. Blocked drive in Ashford Common? Open kerb in Knowle Green? Either works.

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Cars in this corner of Surrey do a particular pair of jobs: light and local most of the week, then loaded to the roof with everybody's luggage for a run to the airport. Those two conditions want different pressures, and the second one happens at motorway speed with the tyres working hardest. Setting the figure properly at the point of fitting takes a minute and saves a set of shoulders.
A kerb strike on the way out for an early flight left a split too near the edge to be repaired. We fitted the correct size at the kerb and set both rear tyres to the loaded figure before the car went anywhere.
There is nowhere sensible on the M25 to be crouched beside a wheel, and the sliproads are worse than the carriageway. Get behind the barrier with everyone out of the car, tell us where you are, and leave the wheel to us.
The replacement was the easy part. The other three sat between six and nine psi under the plate, which is where a car starts eating its outer edges, so they came back up to the figure the maker asks for.
On a plate inside the driver's door frame on most cars, sometimes inside the fuel filler flap, and always in the handbook. Never take it off the sidewall of the tyre. That figure is the tyre's ceiling and has nothing to do with your car.
It usually does, and it is usually far higher than the road wheels. The figure is printed on the spare itself. Plenty of boot spares have been sitting at half their proper pressure for years, which is worth knowing before you rely on one.
Then you hear that on the phone rather than after we have turned up. Popular fitments are aboard already and anything unusual is normally got hold of the same day. Read the numbers off the sidewall when you ring and there is no guesswork.
Yes, as a matter of course, and it costs a couple of minutes. Most cars we go out to have at least one tyre several psi light. That on its own changes how the car steers and how long the new tyre lasts.
Honestly, no. You are buying somebody else's unknown history, impact damage included, and paying most of the price of a new budget tyre for the privilege. A budget tyre in the right size is the better buy every time.
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