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Speedo difference with 18"s?


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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!
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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]
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Your speedometer will be reading 1.9% slower with the new tires.


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

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