The Shimano Deore RD-M5120 rear derailleur can be combined with 2x10-speed and 2x11-speed drivetrains as well as 1x10-speed drivetrains.
It is designed for 42 tooth on the largest cassette sprocket when using a drivetrain with two chainrings, and can handle up to 46 teeth on the largest sprocket when using a 1x set-up.
