Sealed bearings distinguish Dura-Ace pulleys from the rest of the Shimano lineup. The RD-9000-9070 Rear Derailleur Pulley Set uses precision sealed bearings in both the guide pulley (upper) and tension pulley (lower), reducing friction and keeping contaminants out of the bearing races. This construction directly translates to smoother chain movement through the derailleur cage and less resistance in the drivetrain overall. If you're servicing a Dura-Ace rear derailleur and the original pulleys have developed play, grit, or resistance, this factory replacement set restores the smooth rotation that the derailleur was designed around.

The pulleys themselves are constructed from DuPont Zytel, a glass-reinforced nylon that balances durability with low chain noise. The tooth profiles are optimized for Shimano's 11-speed chain dimensions, promoting consistent chain engagement as the chain wraps around each pulley during shifts. Worn pulley teeth can introduce hesitation and noise into an otherwise well-tuned drivetrain, so replacing them as part of periodic service keeps shifting crisp and predictable.

This set fits both the mechanical RD-9000-SS and the electronic Di2 RD-9070-SS rear derailleurs, so whether you're running cable-actuated or electronic Dura-Ace, the same pulley set covers both platforms. Shimano also lists compatibility with the earlier RD-7970 Di2 rear derailleur, which shares the same pulley mounting interface. Installation requires removing the existing pulley bolts, swapping the pulleys, and reinstalling with appropriate torque. The bolts are not included in this set, so you'll reuse your existing hardware or order replacement bolts separately if needed.... Read More