There are two steps in a wheel change nobody would ever notice you leaving out. One is balancing the wheel afterwards. The other is torque, meaning the nuts get done up to a measured value rather than to however hard somebody can pull on a bar. Skip both and the car drives away, the driver is perfectly happy, and the consequences arrive weeks later as a vibration at speed, a warped brake disc or a wheel that has quietly worked itself loose. Those are precisely the two steps most likely to evaporate when it is cold, dark and everyone would rather be indoors.
So a night job runs the same length as a daytime one. The wheel goes on the balancer, the machine reports how many grams belong on each flange, and they go on. The nuts go down in a star pattern with a torque wrench, and the wrench clicks at a value read from the data for that particular car rather than chosen by feel. Overtightening causes as much trouble as undertightening, since it stretches studs, and it is the reason so many people cannot get a wheel off at the side of a road when they need to. None of this takes long. It simply has to actually happen.
The temptation at 1am is to pump it up and deal with it tomorrow. We come out at that hour in NW7, get the wheel off and inspect the tyre from the inside before deciding anything, then repair to British Standard where the damage qualifies. The M1, Barnet Way and the streets around Arrandene sit inside NW7. Locking nuts, alloys, low profiles: The Hale, Arrandene and the M1 all the same. Old tyres leave The Hale, Arrandene and NW7 with us, every time. NW7 takes in Arrandene and The Ridgeway, and we work the lot.
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A late job around Mill Hill is often the awkward combination of a fast road and an unlit lane, with the M1 at Junction 2 sitting minutes away from roads where nothing passes for a quarter of an hour. Neither is a place to be guessing at how tight a nut ought to be. The same sequence runs at any hour, and the two steps that cost time are the two that stay in.
A car in the station car park with a rear tyre down and an early start ahead of it. Fitted, balanced and torqued, which is not a faster process at that hour, only a quieter one. The driver sat inside with the heater running for most of it rather than standing about in the cold.
Before anything could be replaced the wheel had to come off, and every nut had been run down by an air gun to a tension no maker asks for. They came away with a long bar and real effort. They went back to a set figure, which is also what makes the next person's job possible.
A tyre fitted elsewhere in a hurry had never been balanced, and the shake only showed at speed on a dual carriageway rather than around the village, which is why it took weeks to be noticed. On the machine, the fault came to forty grams and two minutes of work.
Only the lighting and the temperature. The sequence is fixed, and the two steps at the end, balance and torque, are the ones deciding whether the job holds up over the following months. They happen at four in the morning the same as at four in the afternoon.
It is a specific figure for your car, set by whoever built it, and it varies a good deal between models. That is the entire reason a torque wrench exists. Feel is not a measurement, and the people who most often get it wrong are those who have done it a thousand times.
The stud stretches, which weakens it, and the nut becomes very hard to remove later on. In a bad case the stud snaps, and a wheel change turns into a garage job with a hub coming apart. It is a slower failure than a loose wheel, but it is not a harmless one.
Yes. The narrow roads above the Broadway are unlit with few sensible stopping places, so describe what you can see around you when you ring and we will agree where to stop before setting off. Our own lighting comes with us for exactly that reason.
There is no need where they were torqued properly, and going at them with a bar risks overtightening them all over again. If anything about the wheel changes, a noise, a shudder or a sense of movement, stop and ring rather than working at a roadside in the dark.
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