Shimano ST-M007 is a high-performance shifting system designed to provide precise and reliable gear changes for mountain bikes. It features Rapidfire Plus levers for quick and effortless shifting, with a light and responsive feel. The ST-M007 is compatible with Shimano's 6-speed rear derailleurs and a triple front chainring setup. It also includes a noise prevention mechanism to eliminate chain rub when shifting to the intermediate chainring.