Diablodriver666

Thanks for this, I found and online calculator so will give that a go. They OEM audi wheels I've got my eye on

Tyre size will be 255/35/20

Hi everyone, I'm looking for some advice on a change I plan to make to the wheels of my S5. I've currently got the stock 19" alloys but really like the look of the 20" RS6 alloys. I've been told they are a straight swop but worried about the following: Speedometer reading accuracy Tracking and suspension setting Loss of acceleration and or top speed If anyone has any experience of this id really appreciate your advice