shralp Posted May 22, 2009 Share Posted May 22, 2009 I'm switching from my stock 17" rims this weekend to 18"Prodrive Pff7's with 225/40/18's Dunlop Direzza's. Does anyone know how this will effect my speedo reading to read either faster/slower than it is now? Compared to my 17's the new set up is just a bit taller when you put the compare the two wheels/tires together. Thanks for any info! Link to comment Share on other sites More sharing options...
SubLo Posted May 22, 2009 Share Posted May 22, 2009 Easy. Figure out the percentage difference in circumference and that's how much your speedo will be off. You can use this one if the lazies set in: http://www.miata.net/garage/tirecalc.html ________________________________________________ [URL="http://legacygt.com/forums/vbpicgallery.php?do=view&g=1980"]'05 BSM OBXT Row-your-own, W.I.P. :rolleyes:[/URL] [URL="http://legacygt.com/forums/vbpicgallery.php?do=view&g=1242"]'06 Shrek B # 64 - The car the wife loved to hate :( Sold...[/URL] Link to comment Share on other sites More sharing options...
phoenix96 Posted May 22, 2009 Share Posted May 22, 2009 Your speedometer will be reading 1.9% slower with the new tires. phoenix96 2006 Legacy GT Ltd · 2011 Outback 3.6R Ltd · 1992 SVX 2006 Outback 3.0R VDC · 2009 Forester 2.5X 2002 Outback VDC · 1996 Outback 2.5L · 1986 GL-10 Link to comment Share on other sites More sharing options...
shralp Posted May 22, 2009 Author Share Posted May 22, 2009 Perfect, thank you sir!! Link to comment Share on other sites More sharing options...
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