This Shimano CUES SL-U6000 Rapidfire Plus Mono 2x lever's refined shape and light operation provide riders with a comfortable easy-to-use interface. Only compatible with Shimano LINKGLIDE front derailleurs.ONLY compatible with Shimano CUES front derailleursLight and responsive front shifting improves efficiency and controlRapidfire Plus Mono shifts both up and down with a single lever2-Way Release adds the ability to activate a release shift by pushing with the thumb1800mm Optislick inner shift cable improves cable routing efficiency and provides excellent corrosion resistanceClamp band mount type