I know I've seen this in other threads too, but In the owners manual, BMW specifically advises against rotating between front and rear axles. Their theory is that once the tires are seasoned in place, rotating would change the handling characteristics of the vehicle. I have an x drive, and my OEM Pirelli's were down to 4/32" at 26k. I replaced them with the new Bridgestone DriveGuard RF's...don't want to mess with changing tires. They're noticeably better than the Pirelli's.
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