I ride with slicks only on non icy days. When there is ice around, I put a Nokian studded on the front wheel only. It creates a lot of drag, but falling would be a lot bigger drag - haha. Most rolling resistance does come from the back wheel. The slick back tire does skid around a bit on the ice, but that doesn't bother me too much. If the front tire goes, though, you will probably fall.