Shimano SL-M510 is a high-performance shifting system designed for triple front chainwheels, offering precise and smooth gear changes. Its Rapidfire technology allows for quick and intuitive shifting with minimal effort, while the SIS (Shimano Index System) ensures accurate and consistent gear indexing. The SL-M510 is compatible with 9-speed chains and features an adjustable lever reach to accommodate different hand sizes. It also includes an optical gear display to easily monitor your current gear position.