[Freeworld]

Re-posted from Tire forum:

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

 

[Bob the V]

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:
http://www.venommotorsports.com/howto/wheeldiameters.htm http://toy4two.home.mindspring.com/tire.html