Swapped tires

I know I jinxed this area for more snow, but I had to put my summer tires on today. Friday evening I hit a decent size rock on I-94... big enough to bend the rim! I do not have a spare 16" rim, so the 17" summer wheels/tires went on today. As much as I love my Sumitomo tires, I have never driven them on ice or snow... I hope I don't have to =)