Quote:
Originally Posted by marsheng
Using the same profile tire and going from 16" to 18" will change the speed by roughly 10%. To be exact 11.1 %.
Do I have 1" all around the existing tire to fit into the bodywork is the question.
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The profile can change, but the overall diameter has to stay roughly equal. I take it the 225/50/18 is for the front? It's almost 2" larger in diameter compared to the stock 225/40/18s.
My Boxster displays (digital) 3mph faster than actual speed, fairly consistent.