I have adjusted out as much of the rear camber as the concentric adjustment will allow. But I have learned it is essential to keep the tires at the reccomended pressure (32 psi). My 19" sport tires were wearing much more quickly on the inner edges at even a few pounds over 32 psi. Now, I'm getting 25K miles with almost even wear.

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2013 X5 3.5i M Sport
2004 M3 cabriolet SMG