I found this link from the A3 forum, thought it might be of interest here. Put in your tire size, tranny, and final drive ratios and get speeds every 2500 rpm in each gear. Not sure how the rolling circumference is calculated for a tire, there will be some error if it's just based on the theoretical dimensions.

I got the tranny ratios from this site (CBD tranny, 4.11 final drive):
http://www.elektro.com/~audi/01E/

I got an error when not putting in a ratio for 6th, so I entered the ratio for 5th twice.<ul><li><a href="http://www.reubenyau.com/rpmspeed.asp">RPM/speed calculator</a></li></ul>

Click on "Gear Head"<ul><li><a href="http://www.cvsr.net/php/links.php">http://www.cvsr.net/php/links.php</a</li></ul>