I have just fitted 18" RS6 Alloys with 235/40/ZR18 tyres to my A4 2.8 Q Avant. Everything seemed fine and have driven some distance to work and back with no probs. Driving up the road though within 24 hrs of changing I have now noticed a slight knocking or clipping noise from the O/S front wheel the def was not there before. Are these tyres/rims too big for my B5? Can I cure with spacers? or has something else happened ie wheel bearings? They were a tight fit esp at the top!