Rs505 hydraulic disc brake mech shifting levers great value sti levers for hydraulic disc brakes offer powerful braking and effortless 11 speed shifting vivid indexing provides a constant amount of shift lever force across all 11 sprockets ergonomic short shift arc follows natural hand movement hydraulic brake lever provides powerful controllable and consistent stopping power with less effort especially from the hood position hydraulic reservoir tank provides pad to rotor clearance auto adjus