I am running 19 x 9 et 33 S5 Speedlines in the C6 RS6 style. I applied a 8mm Spacer/Adapter to fit the larger hubcentric bore of the later model Audi wheel, and which also put me at an offset of et 25. The tires are 255/35-19 Michelin Pilot Super Sport. I am very happy with the set up, although I might be tempted to go 265/35/19 when the time comes. The 255/35-19 tires are slightly "stretched" on a 9" wide wheel - but there are quite a few people who go for this look, sometimes to the extremes. 265 would add a little curb protection.