I tried finding a tire for my 700c road bike as well, but that kind of bike just won't do well in winter. The riding position isn't that great for maneuvering in snow (reach-down to pull the brakes). The clearance for snow tires is bad enough, but try to find some decent fenders otherwise you will be a mess wherever you go. I had an opportunity to ride my road bike last week when it started snowing heavily out of nowhere. By the end of my journey my shoes were soaked. Totally not worth it when I could have just ridden my mountain bike.