I have not touched my derailleur equipped bike since last October. All of my riding has been on fixed gear since. I call it addiction. Riders of the Saturday morning pack ride can't understand why I keep riding fixed with them. At least I'm able to hang in til we hit this one stretch of road when everyone sprints.....not enough gear inches at 79......and I'll straggle in with a dozen or so others. I'm trying to convince a couple others to go fixed.