X5 Excessive Rear Tire Wear

[Tonyfeb14]

My 2003 X5 4.4 152k miles is going through rear tires. This set heavily worn after just 18,670 miles and near needing replacement. The wear is pretty even across the tire, and only slightly more wear on the inner edge (close to center of vehicle). But the outer edge and center are very worn as well. Again, pretty even wear across the tire.

I had the rear alignment checked when first installing the tires. Camber -1.83 L/R, Toe in .14 Degree, total .28 Degree Toe-In, so this looks like within specs per the alignment machine specs.

When I checked a separate X5 spec manual, Toe was within spec, Camber might be off slightly and could be re-adjusted to closer to -1.5 +/18min.

I would consider the alignment all within specs. My tire supplier says he see's lots of X5's that wear the rear tires.

Does anyone else have this experience? Anyone using different alignment specs? I need to check the control arms and bal ljoints for wear but these wear so evenly on both sides, I am thinking alignment or a known problem with this suspension design.