how much effect on speedometer?
I calculated an overall height of 663.7mm for the 18's and 651.4mm for the stock 16's.
Is this the right approach? Will 6mm larger radius change anything at all?
when your speedometer reads 65 you are actually going 66.23 mph.
Here is the link...
http://www.discounttire.com/dtcs/infoTireMath.dos


