Shimano RD-Z505 is a rear derailleur designed for precise and smooth gear shifting. Its Servo Pantagraph mechanism keeps the guide pulley equidistant from the gear sprockets, ensuring consistent performance regardless of the gear being used. The spoke barrier cage and cap prevent the derailleur from interfering with the spokes, enhancing safety and reliability. With a total capacity of up to 40T, the RD-Z505 can accommodate a wide range of gear combinations, making it suitable for various riding styles and terrains.