[kzflags]

its almost a given now that the rule of thumb to follow for xdrive vehicles is to keep the rolling diameters within 1% front and rear. However, from an online manual (which the link is expired lol) it states:

"The tire circumference can fluctuate up to 1% or more as a result of mixed tires or wear. The tire tolerance logic decides depending on the driver's command and driving situation whether the slip is to occur in the transfer case clutch or at the contact area between tire and road.

If the slip is permitted in the transfer case clutch, the locking pressure set by the pre-con- trol is reduced in order to keep the work loss low. In the driving dynamic control situation, the clutch is locked slightly more than normal, the four wheel drive is always guaranteed when required.

For maximum xDrive performance, tires (and wheels) of the same diameter should be installed on the vehicle."

The last part mentions yes, for maximum performance the same diameter should be installed. but how does it account for a set of front tires that are balding and a set of rear tires with close to 100% tread. this will more than likely cause the rolling diameters to be >1% no?

Is there any concrete evidence from a BMW rep or anywhere online that states specifically, the xdrive system will explode and cease to function if the wheels are indeed >1%? Or is this just a myth that has become fact by way of word of mouth? any personal horror stories? any members running wheels clearly >1% diameter on xdrive with no issues