http://www.osella.com.au/gear-ratios.htm
Here is what I found if it's any help to answer some questions about this topic.
www.wheelcalc.com/
This site will help with tyre diameter. Or a quick calculation I think = wheel diameter +tyre profile (height) then multiply by 1.466. So if you are running 195/65R14 then 350mm+65 multiplied by 1.468 = 609.22mm diameter
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