Tires and rims...please help me with sizing basics

[todd.stone@mailexcite.com]

Another dumb question from a newbie to this list...

I have a '98 A4 2.8 Q, and I'm looking into some new tires and rims.  Two
questions:

First, my stock tires are 205/55 R16 W.  Could/should I go to a 215 tire for
enhanced performance without changing anything but the rims?  (the manual
does not address this) 

Second, could/should I go to a 17" rim, again, for performance gains?  The
manual warns against changing overall configuration as it will affect the
Quattro differential (not to mention speedometer, trip computer, et al).

Is there an optimal tire/wheel size combination for "modified" A4's that
takes care of these problems.  I'm NOT looking for competition specs (I
still have to drive to work), just wondering if there are "standard"
modified specs.

Thanks much!




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