Occasionally the tyre is fine and the wheel is the casualty. Alloys are cast or forged aluminium and they do not bend gracefully. A hard hit can flatten a section of the rim flange, put the wheel out of round, or leave a hairline crack in the barrel that is invisible unless you know to look for it. The tyre sitting on that wheel may be untouched, and the car will still lose air, wander, or shake.
This is why we take the tyre off rather than reading the situation from the outside. A buckled flange has an obvious flat spot on the sealing face once the tyre is away from it, and a crack usually gives itself away as a line of clean metal in an otherwise oxidised surface. Selling somebody a tyre for a wheel problem is easy and dishonest, and the whole thing is settled in five minutes once the assembly is apart.
Somebody usually points it out before you notice it yourself. A neighbour, a colleague in the car park, a passer-by who saw the bulge as you pulled in in Woodhall. We come to the car, confirm it, and fit the correct replacement where it is parked, on the A1057 or on a driveway, balanced and pressure-set before we leave. A 4am Woodhall call and a noon Sherrards call reach the same fitter. Whether it is Panshanger in rush hour or the A1000 at midnight, we answer.

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A good number of the wheel injuries we see around here happen at low speed on the quieter avenues rather than at speed on the A1000, because the kerbs are close, the planting hides them and everybody is relaxed. If a tyre keeps going down and nobody has ever separated it from the rim, that is the check worth insisting on before another tyre gets bought.
A flattened section of the rim flange lets air past the bead in a fine line. There is nothing in the tread to find because the tyre was never the problem.
Bright metal in a line across an otherwise dull surface. It is easy to miss with the tyre on and hard to miss with the tyre off, which is the argument for taking it off.
The leafier avenues have kerbs that disappear under overhanging planting, and clipping one squarely is enough to mark a rim. The wheel is the harder of the two components and it still loses.
Sometimes, by a specialist wheel refinisher, and sometimes not. It is not a roadside job and we will tell you honestly which category yours looks like.
No. If the sealing face is damaged, a brand new tyre has nothing clean to seal against and will leak in exactly the same way.
By taking them apart. With the tyre off, the flange, the barrel and the bead seat are all visible, and so is the inside of the tyre.
No, tyres rather than wheels. If the wheel is the problem we will say so, refit whatever we can and point you at what needs doing.
That depends entirely on what we find, and you will get a straight answer rather than a vague one. A crack is not something to drive on.
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