New to the board and to Audi. I am in the process of acquiring an '08 S8 and will be looking to replace wheels and tires. A noob question: If I were to move up to 21" from the 20s, which means losing about a half-inch of tire, does anyone have a sense for how noticeable the tradeoffs would be in terms of ride and comfort? I have heard from a few enthusiasts that it would not be that much of a change.... would appreciate any views.