The Shimano RD3300 Tension and Guide Pulley Set ensures smooth and precise shifting for your 8- or 9-speed drivetrain, enhancing your bike's overall performance. Compatible with Multiple Models: Designed to fit Shimano RD-2400, RD-3500, and CT-S500 derailleurs, this pulley set is a versatile replacement option for maintaining optimal gear shifting. Durable and Reliable Design: Built with high-quality materials, these pulleys are engineered for longevity, providing consistent performance across various riding conditions. Easy Installation: The 9mm inner hole diameter allows for straightforward installation, making it easy to replace worn pulleys and restore your derailleur's efficiency. With top and bottom pulley compatibility, the RD3300 pulley set reduces friction and ensures seamless chain movement, delivering a smoother and quieter ride.