How-to: Rear Derailleur
There are many times when your drivetrain will start making weird noises or just not shift as smooth as you would like, but adjusting the rear derailleur has always been a bit intimidating. There are many factors involved that will cause this to happen. With how tight the tolerances are in 9, 10 and even 11 speed drivetrains, it doesn't take much to cause shifting issues. Extreme changes in temperature, cable stretch, dirt, water, etc. all play a role. So knowing how to quickly adjust for that, especially on the trail, can mean the difference between an awesome ride or a very frustrating one.