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Welcome!
Hmm, comparing the 2 sizes it looks like the new setup will throw off the speedo by 8.7%. The rule of thumb, generally, is to keep the variance under 3.0%. That said, I don't foresee it having any other issues than that. With the XDrive your main concern would be the rolling diameter front vs rear. OVERALL it'll be off on the speedo, but F to R ratio will be exactly the same.
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