theBrit Posted January 13, 2006 Share Posted January 13, 2006 I dont think anyone has brought this up before, but at Quaifes website http://www.quaifeamerica.com/ They have a little program that lets you compare gearbox ratios, diff ratios and tire sizes, it calculates the the shift points, speed in gear etc and even draws comparison graph. It is a little quirky to use IMHO. Mike Quote Link to comment Share on other sites More sharing options...
mtcookson Posted January 13, 2006 Share Posted January 13, 2006 Took me a second to figure out why my top speed was only 30 mph in 5th then I finally realized they wanted circumference of the tire. I accidentally put in the tread width. This program will help you find the circumference in mm http://www.miata.net/garage/tirecalc.html Quote Link to comment Share on other sites More sharing options...
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