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tire problem?

I have recently observed a strange problem on my 4000.  When the car
has been parked for more than a few hours and then driven, there is
a pronounced vibration at speed, almost as if the tires are out of
balance or out of round.  However, after driving for a few miles
the vibration subsides.

What might cause this?  I can't imagine the tires going out of round
from just a few hours of parking?  They have the correct pressures,..

BTW, the tires are BF Goodrich Comp TA ZR, in 205/50ZR15 size, mounted
on Ronal R8 15x6 ET45 wheels.

Any clue?

96 A4 2.8 quattro
84 5000S 2.1 turbo
80 4000 2.0
    ///  Ti Kan                Vorsprung durch Technik
   ///   AMB Research Laboratories, Sunnyvale, CA. USA
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