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Old 03-25-2019, 07:36 PM
Autoputzer Autoputzer is offline
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Location: NW Floriduh
Join Date: Mar 2014
Posts: 9,171
Mein Auto: 2014 535i + 2018 X3 30i
You need the rolling diameter (and therefore tread depths) to be very close to identical to prevent pre-mature xDrive transfer case clutch wear. With a staggered wheel and tire set-up (back wheels and tires wider than the front), xDrive is a no-win situation. The back tires will wear faster, increasing the difference in rolling diameters. With a square set-up, you can rotate your tires to keep the tread depths very close (almost identical) on all four tires.

I think the xDrive hardware adds about 200 pounds on smaller BMW's.

Nobody wants xDrive's here in Floriduh. Even the new BMW SUV's on dealer lots are about 75% sDrive's. We got xDrive because we're eventually moving north where it snows and we'll be living on the top of a hill.
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