Tire and Wheel Size Calculators

[catchacab]

 

Via a rennlist poster

http://www.alloywheels.com/tyrecalc.asp

[Tom Zuraw]

Here is one I especially like:

http://powerdog.com/tiresize.cgi

The entry page does not look like much but the results page works well.

Tom Zuraw

[Larry Herman]

Guys, those calculator forms are fun, but they really are not accurate.  Many tires do not hold true to their markings and can be up to 10mm different than they are listed at.  The best way is to use the manufacturer's actual dimensions for comparative purposes.