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Originally Posted by RandallNeighbour
Somebody who knows really needs to answer the question about speedo changes when one goes from 17's to 18's. I want to go from 17's to 18's and would like to know if my speedo will need recalibration.
Logically, if the circumference of the 18 inch tire and the overall height of the mounted tire are the same, the speedo should be accurate.
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You go to a lower profile tire with the larger diameter wheel to offset the increase so no speedo recalibration is needed. Overall wheel plus tire diameter remain the same. Likewise you maintain your final drive ratio.
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'04 Black Boxster, 18" Carerra wheels
"If you're not living on the edge, you're taking up too much space."
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