Ask a Mechanic: Replacing Drivetrain Components and Adjusting Front Derailleurs Evan2015-03-20T13:04:44-08:00 This is the fifth edition of a column we’re running here at Art’s Cyclery Ask a Mechanic: Replacing Drivetrain Components and Adjusting Front DerailleursEvan2015-03-20T13:04:44-08:00