22F/-6C. After the recent small snowfall I figured there would only be a few spots of the bike path and road covered on my 12 mile commute, thus I didn't swap to the studded tire wheel set. I was right about the total coverage. What I was wrong about was how much you have to respect hard frozen ice ruts. After I just flew over the first couple at roughly 16 mph I just kept doing that. Then there was a nice front wheel diversion and I got to meet the ice up close and personal. No real harm done, a small scrape or two. Just got back on and kept riding. Not enough ice to justify the studded tires but I will be more careful on those ruts.