Shimano RD-RX825/RX820 GRX Rear Mech Pulley Set

The Shimano RD-RX825/RX820 GRX Rear Mech Pulley Set is used to replace worn guide and tension pulleys in your GRX rear derailleur. You use this set to restore consistent chain movement, supported by two matched pulley wheels that maintain alignment and reduce friction through their specific tooth profiles and sealed bearing design.

Key Features:

• Matched Guide and Tension Pulley Wheels: These pulleys use Shimano’s specific GRX tooth profiles and sealed bearing construction, which reduce drag and maintain chain stability, supporting smooth shifting and helping you keep consistent drivetrain performance across varied surfaces.
• Direct Compatibility with GRX RD-RX825 and RD-RX820: This fitment specification ensures that the pulley geometry, offset and bearing load match your derailleur’s design, maintaining correct chain tension and allowing you to replace worn parts without affecting indexing accuracy.
• Genuine Shimano Replacement: This OE build uses the same materials and tolerances as the original derailleur pulleys, giving you predictable wear patterns and allowing you to maintain reliable function through routine replacement at service intervals.

This pulley set helps you maintain stable shifting when your original pulleys start to show wear, which is important when you rely on accurate chain control across mixed terrain. You gain a simple replacement option that restores drivetrain consistency without altering the setup of your GRX rear mech. It is a practical addition to your maintenance kit when you want predictable performance from your gravel bike.