Coming September 21, 2016. What is the drivetrain? Learn that and more at the She Bikes Cascade Chains and Derailleurs class. This 2.5 hour class is just for us ladies and taught by knowledgeable ladies. Held at the Cascade Bicycling Center, in Seattle, you’ll learn chain maintenance, derailleur adjustment, and troubleshooting system problems. Be sure to bring your bike for this hands-on workshop!