Shimano RD-RX400 GRX Rear Mech Pulley Set

The Shimano RD-RX400 GRX Rear Mech Pulley Set is used to restore smooth shifting in your GRX rear derailleur. You use it to replace worn guide and tension pulleys, which support chain movement through the derailleur with two matched pulley wheels built for the RD-RX400 unit.

Here are the key features of this pulley set:

• Guide Pulley Design: This pulley uses shaped tooth profiles and precise machining to control chain engagement, which helps you maintain consistent shifting under load and provides steady chain tracking across the cassette for reliable operation.
• Tension Pulley Design: This pulley uses a sprung tension layout and durable bearing interface to manage chain slack, which helps you reduce unwanted movement in the chain path and ensures stable shifting throughout your ride.
• Genuine Shimano RD-RX400 Fitment: This set matches the original GRX RD-RX400 derailleur fit and spacing, which helps you install it without modification and ensures the derailleur functions as intended with dependable shift accuracy.

You use this pulley set to restore the shifting quality of your GRX drivetrain, which helps you keep chain movement smooth and predictable on mixed terrain. Replacing worn pulleys maintains consistent performance, making this set a practical addition to your gravel bike maintenance routine. It offers a smart choice for keeping your GRX rear derailleur working as you expect over long-term use.