drove in my Toyo Proxes all-seasons & 20s just fine again in 2" of snow. No problems.

I got a 328xi loaner (for '09, they call them 328i with xdrive badging on the side actually - that threw me)... and you can tell the 17s were more ideal in the snow, but the 20s did not falter all that much more. I think the weight of the X helps it too. I was so glad to be back in the X... the difference in comfort was night and day, to be honest. The interior is much better done as well... it made me appreciate it more.

And for anyone interested... the lighter 328 @ 230hp is worse than the heavier X5 @ 260hp.

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'08 X5 3.0si - Alpine White / Saddle Brown interior
Specs: Sport Pkg, Premium Pkg, Tech Pkg, Comfort Access, Aero Kit, Style 433 staggered 20s on Conti DWS
Mods: Carbon 35 tint, LED angel eyes, GP Thunder 7500k fogs, H&R 20mm/25mm spacers, clear reflectors, gunsmoke-tinted taillights
Coded: Digital speedo, windows/sunroof/tailgate close via keyfob

X5 pics at Flickr