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My front tyres also went slightly out-of-round about a year ago - the dealer told me that Michelins are know for this (never heard it elsewhere) but I assumed it was because the car had at one time stood unused for a long while, so both front tyres had a flat-spot.
The car has been driven normally for 67 000 miles, and until recently I used 30psi all round.
Today, when I reduced the pressure from 40 to 30psi the deformation reduced quite markedly.
Whether or not the higher pressure made any difference in itself - the tyres are obviously unsafe, and I probably would not have noticed anything wrong had I been using normal pressure.
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