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      03-03-2020, 10:20 AM   #2
scotchy
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Drives: 2020 X5 M50i
Join Date: May 2014
Location: Canada

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Have you a rwd or awd?
If rwd you might be ok to do it, not sure how it'll affect your speedo though or possibly traction control and other safety features.
On awd you want to keep front and rear diameters the same or as close as possible. I'm not sure the tolerance but changes outside a certain percent can cause failure/issues and likely void warranty.
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