Aircooled VW South Africa

there was some debate about wheel and tyre sizes and speedo readings on one of the threads a while back....can't remember which one...but i found this in one of the mags.
could help if you need to know........

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

Here is another one that I normally use.

http://www.1010tires.com/tiresizecalculator.asp