The problem with the Michelins that come on the X3 is that they are awful. Of the OEM tires the Pirellis are by far the best. If you have been happy with them, IMHO, don't change a thing.

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05 X3 3.0 Sp, Prem, Xenons, CW, Nav, DSP, 6-Speed, Privacy Glass, Servotronic [/IMG] http://randall-harris.com/sitebuilder/images/IMG_3399-600x450.jpg[/IMG]