I found a set of 19's with all seasons on ebay for $1400 incl shipping. We'll see how they perform. I'm sure it will be better than the 20's - although not as good as snow tires.

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08 BMW X5 4.8i - GONE after 6.5 yrs
Space Gray / Light Beige
Premium, Sport, 20's, Technology
SAT, Rear Climate,Heated