So since this is a snow thread I guess it's ok to talk about my snow fixie. I built it at the beginning of this winter. It's a trek cyclocross frame converted to fixie with low ass gearing. The thing that makes it bad-ass in the snow is I took the front cross tires and mounted 150 or so sheetmetal screws into it. I planned on doing the back tire as well but after about 30 minutes riding around i realised that I had made the perfect skidding snow sliding machine. The front tire holds traction in just about anything and you can skid and whip around the back tire as much as you want. It's a blast to ride. I recommend anyone who gets a good amount of snow stud up a front tire. I can post some pictures if anyone is interested.