Raise the rear of the car and spin the wheel to check for obvious wobble. If no visible wobble, then put a straight edge, like a wooden paint stirrer, on top of a jackstand and position it so the straight edge just touches the outer edge of the rim. Spin the wheel again and see if you can detect a wobble or out of round condition.
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Current car
2000 Boxster 2.7l red/black
Previous cars
1973 Opel Manta
1969(?) Fiat 850 Convertible
1979 Lancia Beta Coupe
1981 Alfa Romeo GTV 6
1985 Alfa Romeo Graduate
1985 Porsche 944
1989 Porsche 944
1981 Triumph TR7
1989 (?) Alfa Romeo Milano
1993 Saab 9000
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