Hello everyone. I know winter is a long way off (snow is a very recent memory here in Chicago), but I was wondering a few things about setting up a bike for winter. I just bought a Surly Cross Check to serve as my do it all bike and I plan to use it during the winter months for city commuting in Chicago. I noticed that a lot of people on this forum switch to single speed and fixie setups for the winter. What is the logic behind this? Is it just an ease of maintenance/preserving your good drivetrain from salt/moisture issue? Is it imperative that I switch my drivetrain for winter?