Clarkson put the X6 on television with the summer tires to make it look bad on purpose. You can see the words Sport Maxx on the tires when it spun in the snow... we here know those are summer tires...

Anyway, before I got my 20" all-seasons, I had the stock 19s with Michelin all-seasons and even in those I was easily going up hills that other vehicles were stuck in (drove by a few and was wondering if I were next)...

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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