The Shimano GRX RD-RX827 Di2 1x Rear Derailleur is purpose-engineered for the extreme demands of gravel racing and adventure riding. Optimized for use with a wide-range 10-51T cassette, this derailleur delivers crisp, wireless shifting across an enormous gear range—allowing riders to conquer steep climbs, fast descents, and everything in between with total confidence. Designed around Shimano’s latest SHADOW ES architecture, it maintains a low profile while offering a slimmer, more robust evolution of the SHADOW RD+ chain-stabilizing concept. With an extended SGS cage length, the RX827 ensures smooth chain management and drivetrain quietness even on the roughest terrain.

Built for durability and consistent performance, the RX827 features a rugged construction with a wide-link design, reinforced aluminum outer plate, and impact-resistant solid pulleys. Its Automatic Impact Recovery function adds an advanced layer of protection by instantly returning the derailleur to its correct position after an impact—ensuring uninterrupted shifting even in chaotic conditions. The derailleur’s integrated skid-plate design further shields vulnerable components from trail hazards. A safely enclosed battery compartment protects the Di2 power source from dirt and shock, yet remains easily accessible for quick charging. Whether you're racing across the Flint Hills or tackling backcountry routes, the RD-RX827 provides pro-level performance and reliability where it counts most.