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Re-posted from Tire forum:<P>After some analysis of the wheel and tire options for the S60, it appears that the <BR>diameters of each of the options is different enough to yield an almost 10mph delta from <BR>the smallest combination to the largest. I was wondering if anyone knows whether the <BR>speedo is recalibrated depending on which option is selected? If so, and aftermarket <BR>wheels are purchased, is it that easy to recalibrate the speedo later?
 

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Your best upgrades that won't screw up your speedo readings follow the accepted "+" formulas (+1, +2, etc.). Here are two websites which tell you loads of info, play with the numbers:<BR> <A HREF="http://www.venommotorsports.com/howto/wheeldiameters.htm" TARGET=_blank>http://www.venommotorsports.com/howto/wheeldiameters.htm</A> <A HREF="http://toy4two.home.mindspring.com/tire.html" TARGET=_blank>http://toy4two.home.mindspring.com/tire.html</A> <BR>
 
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