for your safety, dont drive on those z-rated summer tires in the snow. It's like being on ice. They just dont work with snow or slush. At a minimum get some all seasons, but if your'e going to go through the expense of getting another set of tires, get blizzaks. Blizzaks are the closest thing to tank tread in the snow. You wont regret your purchase. and getting a set of stealies will pay for itself in about 1.5 years (plan on at least $40-50 to get the rubber changed on your rims, 2x/year... adds up fast, get steelies and hubcaps and you can change the wheels yourself every year for free)
