Quote:
Originally Posted by Chase
I believe going from a 17" wheel on the Si to my 18" wheel with 225/40's changed my Speedo to read .5mph fast which is acceptable. It seems on modern cars they should allow you to "set" your wheel and tire size so that your ECU can compensate and calibrate your ECU's. Oh well..
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Actually your speedo is now off by 1.8% (when speedo reads 60 you're actually doing 61.1). There is a great calculator to use here:
Wheel / tire size calculator / comparer - WHEELSMASTER