A tyre in the wrong size will fit the rim, hold air and look perfectly convincing, and it will slowly destroy itself against the car. Go too wide or too tall and the tyre finds the arch liner on full lock, or the suspension leg, or a brake hose. What that contact leaves is a smooth polished band running round the sidewall or the shoulder, quite unlike anything the road makes, and once it has been rubbing long enough it starts taking material off the casing.
We look for it whenever a tyre comes off with damage nobody can explain. It is more common than it should be, usually because somebody fitted whatever was available on a day when the correct size was not. The right size is on the plate in the door shut and on the sidewalls of the other three, and a tyre that does not match those is a problem regardless of how new it is.
A car that has been sat unused for months often needs tyres before it needs anything else. We can look at it where it is parked in Alperton, tell you which of the four are genuinely past it, and fit replacements there without the car making a journey it is not really fit for. Level in Tokyngton, sloping in Alperton: we set the car straight first. Underground parking in Tokyngton or Alperton is worth flagging. A HA9 address in Alperton and one in Sudbury are the same round.

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A fair amount of the odd damage we see around Wembley comes from tyres bought in a hurry somewhere else and never questioned afterwards. The check takes a minute: read the size off all four sidewalls and compare them with the plate in the door shut. If one does not match, that is worth a conversation before it takes any more material off itself.
Smooth, even and in one line right round the tyre. The road does not do that. Something on the car is touching it, and it will only get worse on full lock or over bumps.
It fits the rim and it does not fit the arch. Compare the sidewall markings on all four and the odd one out is usually obvious once you know to look.
Clearance disappears when the suspension compresses. A tyre that is fine empty can be catching hard with four people aboard, which is exactly when you least want it.
The plate in the driver's door shut lists what the vehicle was built for, and the sidewalls of the existing tyres tell you what is actually on it. Those two should agree.
It can be. Width, profile and overall diameter all affect clearance and the speedometer, and the margins on a modern car are not generous.
No. Once material has been worn off the casing the tyre is compromised, and the cause is still there anyway. It needs the correct size fitting.
In most cases yes, from van stock in the common car, SUV and 4x4 fitments, balanced and torqued at the vehicle.
Worth it. If one wrong tyre has been fitted at some point, it is not unusual to find a second, and it costs nothing to read the sidewalls while we are there.
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