I made the same tire switch a few months ago and completely agree with your assessment.

Interesting about the tread width on the fronts (275's)- I noticed the same thing and though it was just an optical illusion because of the different tread pattern. I assumed 275 meant 275 regardless of tire brand/model.

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2008 X5 4.8i, Jet Black, Tobacco Nevada leather & just about everything else (no vent. seats, no 3rd row)