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on the bmw e91 wagon, how much of a downside would it be going from 225/45R17 to 225/45R18 same offset. I did the calc and it is a 4% difference in diameter, and the speedo "error" would be as follows:
Actual Reading
20.8 20
52 50
93.6 90
With BMW speedometers reading slow anyway, would that delta be a big deal? I'm thinking it would be pretty close to making the speedo read correctly.
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Josh (PA) -
'19 X5
'17 991.2 C2 Cab
'11 135i Convertible
'11 328xiT
'09 X3
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