Yet another tire size calculator. I happen to like this one as it gives a
good visual of the differences you make with different tire and wheel
sizes, as well as the calculated stuff: circumference and speedo changes, etc.

http://www.miata.net/garage/tirecalc.html

remember to thank a miata next time you see one..

steve
'85 westy
no miata's, just trespassing on their site
kent, wa