Bike chains and derailleurs--the most mysterious of all bike systems, and by far the most finicky. If you've ever struggled with a chain falling off the gears, if you can't seem to keep your chain from squeaking (or worse, from getting gummed up), or if you're sick of hearing a persistent rubbing on your front derailleur, this is the class for you. We'll cover preventative maintenance, limit screw adjustments, cable tension and chain replacement 101 so that you can be confident and squeak free with your chain fully engaged.