I run 18inch 69's with 265/55 Dunlop Wintersports on my 4.6, however, my friend runs 275/40/20 Pirelli Ice&Snows all the way around on his 4.8. We live in Denver and he takes his 4.8is to Vail every weekend in the winter and has had no problems in the snow.

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2003 X5 4.6is