I agree with X5Andrew...it might not be mandatory, but it makes darn good sense to do an alignment with every tire change. Not just any alignment will do; it should be done by a BMW dealer or a BMW specialist who uses the factory alignment specs and weighting procedures. I personally think the $75 or so spent on a good OEM alignment is a better investment than the same amount spent on a tire warranty, IMO.

(But hey, what do I know? I also happen to be one of those mavericks who still rotate tires regularly despite what the manual says...of course, this is the same manual that recommends against changing transmission fluid because BMW uses "lifetime fill" fluid...)

Mike

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