Wasnt too sure as to where to post these so please move if need be.... I found these while researching what to use for my car. Ones a calculator for comparing 2 different sizes of tires-how it will affect speedometer mainly but kind of cool. http://www.tacomaworld.com/forum/tirecalc.php?tires=205-70r14-235-60r15 The other is a collection of charts that also gives general specs for different tire sizes. Good for cross ref old letter to newer metrics etc.(this is where i got the specs for the D70's that came on mine and put 205/70's as my baseline to put in the other site) http://www.carnut.com/specs/tires.html