Help with tires on my A4 got a good deal on Michelin Pilot Sports need rims
For 18" stick with 225/40/18 to be safe. It may be possible to get by with 235/40/18 depending on wheel offset, tire brand/model (they aren't all the same width even in the same size), ride height, and suspension stiffness (including ARBs).
As jprice noted, those tires are not only too wide but also too tall for B5 A4. Get rid of them and get 225/40/18.



