Hmm, I personally found tire mobility kit to be much convenient then having a spare tire. Tho I would like to carry spare on those long drives and I have a 5 seater so no problems there either. But for now, got Run Flats, and thinking about getting Conti DWS but can't find the front ones (275/40/20).

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2008 Alpine White X5 3.0si
AG Sports Package
Premium Package
Technology Package
Winter Package
Comfort Access