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      07-30-2011, 11:46 AM   #3
Rob@StrasseWheels
 
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Drives: 2013 MW/FR E92 M3
Join Date: Jul 2011
Location: South Florida

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Well the speed that the speedometer is read is measured by revolutions the speed sensor in the transmission picks up coming from the output shaft... That is all i know haha but you can use this chart to measure overall diameter between tire sizes!

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