Arif Posted February 26, 2003 Share Posted February 26, 2003 Does anyone know how to figure how far off my speedo will be if I go from 195x70x14 tire combo to a 215/45/17 AND change from a 3.54 to 3.7 diff. I can't find any calculators on the web that allows me to change tire sizes and diff ratios to check the accuracy of my speedo. Someone put their Math/Engineer degree to work on this one. Thanks Quote Link to comment Share on other sites More sharing options...
Scottie-GNZ Posted February 26, 2003 Share Posted February 26, 2003 By my calculations, here would be the engine speeds at 70mph in 4th gear (1.0:1): 195/70-14 & 3.54:1 = 3,455.6 RPMs 215/45-17 & 3.70:1 = 3,629.7 RPMs HTH Quote Link to comment Share on other sites More sharing options...
Guest greimann Posted February 26, 2003 Share Posted February 26, 2003 Try this calculator: http://www.c5-corvette.com/tirecalc.htm Quote Link to comment Share on other sites More sharing options...
zed660 Posted February 26, 2003 Share Posted February 26, 2003 See if either of these help http://www.geocities.com/z_design_studio/ http://www.miata.net/garage/tirecalc.html Cheers Geoff Quote Link to comment Share on other sites More sharing options...
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