A patch has weight. It is not much, perhaps twenty or thirty grams of rubber and reinforcing once it is bonded to the inner liner, and it is all in one place on the inside of a wheel that spins several hundred times a minute at speed. That is enough to put the assembly out of balance, and an out-of-balance wheel announces itself as a shake through the steering wheel somewhere between fifty and seventy miles an hour.
So rebalancing is not an optional extra tacked onto the end of a repair, it is part of the repair. The wheel goes on the balancer after the tyre is refitted, the machine tells us where the heavy point is and by how much, and weights go on to cancel it. Skipping that step is how somebody ends up with a perfectly good repair and a car that feels wrong on the A1(M), and then blames the patch.
Away from home and a flat overnight is the worst combination, because you have no idea who to ring. A hotel car park, a relative's street, a road you have never driven before, Peartree or anywhere else round Welwyn Garden City. You watch it happen in Hatfield Hyde, or at the kerb in Handside. Same tools in Peartree as in Woodhall, same on every call.

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The dual carriageways around the town centre and the A1(M) at Junctions 4 and 6 are exactly the roads on which a balance problem shows itself, because you are up at a steady speed long enough to feel it. If a repair has left the car feeling different at speed, the answer is usually weights rather than the tyre, and it is worth saying so when you ring.
Almost always balance rather than the patch itself. The repair added mass in one spot and nobody put the wheel back on a balancer afterwards.
Weights fitted for the previous state of the wheel are simply extra error once the balance has changed. They come off before the new reading is taken.
The balancer is on the van, so the whole sequence happens at the car regardless of the hour. A repair finished at midnight is finished, not half finished until somebody gets to a garage.
Every one. The patch changes the balance of the assembly and there is no sensible way to finish the job without correcting for it.
Yes, the balancer travels with us. That is one of the things that makes this a proper fitting service rather than a get-you-home.
Because an out-of-balance wheel resonates at a particular rotational speed. Below and above it the effect fades, which is why it seems to come and go.
24 hours a day, every day of the year, including the business parks and the A1(M) approaches. Typical arrival is 30 to 60 minutes.
No. You get the price before we set off and it does not change with the hour or the date.
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