tire size calculator
 

Here is a useful tool I thought you all might enjoy. I recently got a set of used rims and tires that differed in size from my factory's size and everyone gave me a different answer(not on this site) about what the effects would be. The following link will take you to the calculator.... :yes:

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

Thanks for the link, Ive added it to the Tire Specs sticky. :yes:

super cool...now I gotta go out and check my tires so I can play w/ it