A tyre dealer fitted a tyre a different size to the other 3, does this matter?

I asked a tyre dealer to fit a new tyre to my car, but while checking the pressures a few days later I realised that it didn't match the others on the car. I now have three 185 55R15 and the new one is a 195 55R15.

Different size tyres on the same axle are a reason for failing the MoT so you need to ask the supplier to change it for the correct size.


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