This calculator will show you an outline of your current size tire compared to an example you type in. It also will give you a printed listing of the sidewall, radius, diameter, circumference and revolutions per mile of each tire. This calculator has helped me many times over the years with tire clearance, mph/rpm, and other areas. This will also help determine circumference to show the effect of staggering tire sizes on awd cars. (How much further one tire rolls per revolution compared to another)
http://www.discountpartcenter.com/tirecalc.html
Save it to your favorites list, it's a great tool.
Tire Calculator
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Monochrome
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Tire Calculator
2020 Miata Club - BBS package
2020 GMC Sierra Elevation Duramax
2014 Exomotive Exocet - #101 "shocker yellow" - sold
Read more: http://mevowners.proboards.com/thread/5 ... g-pa-build
99 Solano Black VR4 - #16 of 287 - ground up restoration - sold
"I don't actually work on cars, I just talk about them on the internet."
2020 GMC Sierra Elevation Duramax
2014 Exomotive Exocet - #101 "shocker yellow" - sold
Read more: http://mevowners.proboards.com/thread/5 ... g-pa-build
99 Solano Black VR4 - #16 of 287 - ground up restoration - sold
"I don't actually work on cars, I just talk about them on the internet."
Re: Tire Calculator
Support the people who made that script! 
http://www.miata.net/garage/tirecalc.html
This is the original site for that piece of software.
http://www.miata.net/garage/tirecalc.html
This is the original site for that piece of software.