My bike runs better in the cold but 21 degrees is ridiculous. I just posted this pic because when it's too cold to ride it and I don't have time to wrench on it, I can at least enjoy looking at it. I keep telling myself that I'm going to build a rigid someday (not with this bike. I like this bike exactly as it is.) but there really is something awesome about the 4-speed swing arm frames lowered a couple inches.