rymo

Hey Everybody, I've got an 08 Q7 with the stock 18" wheels and am looking at upgrading to the 20-21" wheels (likely just the factory Audi wheels off ebay or Craigslist) Is there anything I need to be aware of when considering the upgrade? Will the ride change much with a lower profile tire/bigger wheel? Anything else that might not be obvious?

Thanks!
--rymo