I haven't ridden my fixed gear since October when the temp started to drop below freezing. I pulled it out of the garage yesterday to relube the chain and give it a once over in preparation to start using it to commute to and from my second job. I noticed that the drivetrain seemed to be a lot noisier than I remember it being. It isn't necessarily a "bad" sound, just a lot louder. Would having the bike sit in a cold garage over the last couple months cause this to happen? Only thing I can think of is the chain became super cold and that somehow was causing to be louder than normal. I cleaned off and relubed the chain and didn't notice an immediate difference, however I decided to keep the bike indoors from now on in hopes that it will get quieter as it warms up. Anyone have any thoughts as to what else could be causing the issue? All the bearings are sealed, and the noise seems to be originating more from the rear wheel than the cranks.