Yes I agree with the comment about the psi. Wear at the center of the tread means the air pressure was most likely too high. There are other causes. But in your case I bet it was psi. I am not sure about the proper psi for your ride but for your next set on the rear try not to over-inflate.
Quote:
Originally Posted by JCL
40 psi sounds high. That won't help wear.
There isn't a 2010 manual on this site, but the 2009 manual posted lists the X6 50i tire pressures as 33 psi for 19", 36 psi for 20 or 21". Check your door jamb, and your manual, and see if they correspond to each other. There have been posts about people having different labels on the door jamb than in the manual.
Rear tire wear is impacted greatly by toe-in settings. Even if it is within spec, it needs to be at the low end of the spec for maximum tire life. If not, the rear tires are scrubbing with each rotation and can wear very quickly.
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