Have the chance of 4 genuine RS4 alloys and was wondering if they would fit my car without causing any handling/quattro problems? Asked the Audi dealer and they didn't really know, only said the standard S3 alloys are offset ET 54 and the RS4 ones are ET 29 which does not mean much to me!! They come with tyres 255/35/19, i didn't realise the tyres were so fat on a RS4. Have noticed though looking round Audi seem to have done the same for RS4 alloys what they did for the old 18in RSTT alloys in that the genuine ones off a TT or 8L S3 were dished in the middle and the spokes bent towards the dish. The replicas both from other companies and Audi themselves (if not bought on a genuine model) were flat faced. Saw some 18in RS4's on a new TT in the showroom yesterday and they were completely flat compared to the RS4 next to it!