I want to buy a set of wheels off a 2012 A5 to put on my 2003 TT. Both cars have 18" wheels w/ 245-40-18 tires. I assume the the A5 would have the bigger brakes, so shouldn't have a problem there. So bolt pattern, and possibly off set, should be the only possible problems. Anyone know if the they will bolt up?

 

No - the TT (at least the earlier ones) had a 5x100 bolt pattern. Other Audis used 5x112.