S6/S7 Wheel and tire question
 

I'm planning to change to the 20" wheels from the S6 (if I can get a good price) but I have a 2 part question:

1. Will the rims from the S7 fit on an A6?

2. Can someone recommend a tire that's a good balance between price and performance? I truly don't believe that Michelin tires are worth the additional $150 per tire. Please correct me if I'm wrong but I really feel like I'm paying for the name Michelin.