Wheel nuts have a number. Every manufacturer publishes a torque figure for them, commonly somewhere between 100 and 140 newton metres depending on the car, and that figure is what the studs and the seats were designed around. An air gun does not know the number. It delivers whatever it delivers, which depends on the line pressure that morning and how long somebody kept their finger on it.
That is how nuts end up needing a scaffold bar two years later, and how alloys end up distorted around the seats. So the wheel goes back on with a torque wrench, in a star pattern, to the figure for that vehicle. It adds two minutes to a job that already involved bringing the tyre out to you. When a replacement is urgent that discipline matters more rather than less, because being in a hurry is precisely the circumstance in which somebody reaches for the gun.
Give us the full sidewall code and the answer comes back quickly. Width, profile, rim size, then the load index and the speed rating, something like 225/45 R17 94W. From that we can tell you exactly what we can bring and when, anywhere in N17. The wheel comes off in Northumberland Park, not on a ramp in Harringay. Nothing is towed out of West Green or Seven Sisters; the work finishes there. A N17 address in Seven Sisters and one in Northumberland Park are the same round.

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There is nowhere along the High Road corridor to change a wheel properly and nowhere much better on the North Circular. That is the plain practical case for bringing the tyre to the car. It also means the whole job, including the part with the wrench at the end, happens at a kerb rather than behind three other cars in a queue.
A wheel on a car near Bruce Castle had been run up so hard that the nuts had bitten into the seats. We fitted the new tyre and set every fastener back to the correct figure.
A tyre wrecked against a kerb on Monument Way was needed the same evening. The right size came off the van, went on and was torqued rather than rattled up and hoped for.
A driver near the stadium could not have moved the car for hours even with a sound tyre on it. We came to the vehicle, fitted the replacement and were away before the crowds were.
It matters in both directions. Too loose and the wheel works against the studs until they fail. Too tight and you stretch the studs and distort the seats, which is how a wheel bolted on hard still manages to come loose.
It does no harm and plenty of people like to. If they were set with a wrench to the right figure they will not have moved, but a brace in the boot and a check after fifty miles costs nothing at all.
It is published by the maker and it is on the van. It varies by model and by whether the wheel is steel or alloy, so it gets looked up rather than estimated.
That is the aim. We read the size, load index and speed rating off the tyre still fitted and bring the closest match we hold, because the pair on an axle is what governs how the car stops.
Yes, it goes with us. You get shown what finished it first, so the decision to replace rather than repair is one you can see the reasoning behind rather than take on trust.
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