Experience the unbeatable performance of SHIMANO DEORE REAR DERAILLEUR, RD-M4120, SGS 10/11-SPEED, TOP NO. With a sleek and durable SHADOW RD design, this derailleur is ideal for 2x10 and 2x11-speed MTB rides. Its low-profile design protects against rock damage, and its high-quality pulley teeth ensure smooth shifting for both 2X11 and 2x10-speed setups.