Get Schooled By BMW On Winter Versus Summer Tires

As Carscoop points out:

Summer tires will lose most of their elasticity at 7 degrees Celsius (44.6 F) and it only gets worse as temperatures drop further. Grip will be almost non-existent and having four-wheel drive doesn’t help either. If you still have doubts, follow the break to check out a video from BMW showing the new X3 with summer tires rendered useless in the snowy Austrian Alps.