I just bought my 94 s4..It vibrates the whole car whenever I reached 60-65 mph..It got brand new set of tires I bought the car with the tires and the guy told me they were only 2 weeks old..I can visually confirmed that they are pretty new. I wasnt sure though if they were really balanced..My question is, is there any possible causes of this vibration beside the tires not being balanced?

I just passed the smog test today..