Gear Watch: How To Get a Perfectly Clean Chain + Drivetrain – MTB Maintenance By Global Mountain Bike Net February 12, 2017 With a clean chain and drivetrain, your shifting will be smoother and your bike will work better. Here’s how to do it. Share This: Tweet Global Mountain Bike Net Not much is known about Global Mountain Bike Net, though the legend grows each day. Subscribe! Enter your email address to receive our top stories via email each week.