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Analyst + Therapist = ...
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Discussion Starter · #1 ·
http://www.miata.net/garage/tirecalc.html

Maybe you guys knew about this,

but it's new to me.

If you want to increase your rim size, and you aren't sure how much profile you need for your new tires (so that your speedometer is correct) this calc will do the math for you:thumbup:
 
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