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Just bought an XDrive and was browsing the internet looking for common issue and found several entries regarding the need for careful coordination of tyre changes to avoid transfer box problems. This was to keep the rotational length across all wheels within a tolerance of <1% [apparently BMW specified].
Would any of the owners on the spreadsheet say they had significant differences in tyre wear and replaced odd tyres or only pairs, even across the same axle? If so, the internet posts suggest that may have been a contributing factor.
It would make sense for the worn clutch plates as each wheel / axle would almost constantly be rotating at different speeds when travelling straight and so would have to be compensated for in the diffs / transfer box. If the front / rear circumferences were different it would probably be the trasfer box itself I guess.
Would be interesting to know if anyone who bought a car direct from BMW was ever told to change tyres ensuring similar tread / brand etc specifically to minimse transmission problems OR ONLY when something breaks?
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