snow chains on the Canadian smarts if it gets really bad ... we don't typically get as much snow as MSP in Chicago but do get our fair share, once we get our smart it will be spared snow and salt at least the first year (it's actually car #4 ... Miata & smart will be stored, an old Dodge minivan and Mazda3 will serve us both during the worse part of winter).
My Brother has a 2002 Fourtwo in Germany. Wife got into a fender bender the first snowstorm. He got Blizzak type winter tires for it. The car has no problems now but be careful with it in snow without snowtires until you are familiar with the way it handles.Think rear weight bias.
They will be one of my first purchases before next winter sets in.