Utilizing the SHIMANO SHADOW RD+ design, the SHIMANO DEORE M5120 rear derailleur delivers consistent MTB shifting performance over rough terrain. positions. FEATURES: Low profile design avoids damage from rocks Chain stabilizing technology reduces chain drop and makes for a quiet drivetrain in all gears 46T(1x10), 42T(2x11/2x10) : Max Low Sprocket Pulley teeth: 11 SPECS: Color: Black Drivetrain Speeds: 10 , 11