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Old 01-03-2013, 01:47 PM
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AnotherGeezer AnotherGeezer is offline
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Originally Posted by Fudman View Post
The tire diameter for a tire mounted on a 17" wheel should about the same as a tire mounted on a 16" wheel, irrespective of tire width. Otherwise, the speedometer would need to be recalibrated. The difference in tire sidewall height is compensated by using a different aspect ratio when sizing the tire (235/45-17 vs. 225/55-16) to a different diameter wheel. Hence, the BMW guidance does not make sense. The tire clearance should be about the same if you are staying within the recommended tire dimensions.
Diameter yes. Width, not so much.
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