For those of you considering different rim diameters and tire sizes, there's an online tire size calculator at
http://www.drivingevents.com/resources/tirecalc.cgi You put in up to three tire sizes and the calculator returns a comparison of sidewall height, overall diameter, and circumference. The related site,
www.drivingevents.com is also very informative.
Ned M.
[This message has been edited by Ned M (edited March 24, 2001).]