cc Using a low profile SHIMANO SHADOW RD design, the SHIMANO DEORE M4120 derailleur is perfect for 2x10 and 2x11-speed MTB riding.Pulley teeth: 11Low-profile design avoids damage from rocksFor 2X11 and 2x10-speedItem SpecificationsColorBlackDrivetrain Speeds10Drivetrain Speeds11 ----3 L----2009945(082)1/11 101922(10:10/25/22:ari