Shimano ST-1055: Enhance your cycling experience with precise and smooth shifting. Effortlessly change gears from the large to small chainring and vice versa using the dual levers. The trimming feature minimizes chain noise by fine-tuning the clearance between the chain and chain guide. Compatible with front chainwheel tooth differences of 15T or less, this brazed-on band-type front derailleur offers a wide range of adjustment options to suit your riding style.