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  1. Whirr at high speeds - Tyre balance or sthg else?

    Alfa 164 & 166
    Just came back from S France - another intercontinental perfect journey in the 166. I noticed that at high speed (~ 80mph) on the ultra smooth French autoroutes, I got a mid to high pitch whirring sound from what seemed the rear wheel(s). Is this a wheel slightly off balance or could it be...
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