Shimano GRX Di2 RD-RX827 Rear Derailleur – 12-Speed Shadow ES, SGS Long Cage, 51T Compatible
The Shimano GRX Di2 RD-RX827 12-Speed Rear Derailleur is purpose-built for gravel and adventure cycling, delivering precise, wireless electronic shifting and unmatched drivetrain stability across rough terrain. Engineered with Shimano’s proven GRX gravel-specific ergonomics, this derailleur combines durability, reliability, and performance for riders pushing their limits on dirt, gravel, and mixed surfaces.
Equipped with Shadow ES technology, the RD-RX827 features a low-profile skid plate design for maximum ground clearance, plus a dual spring chain stabilising system that drastically reduces chain bounce on rough trails. The result is a smoother, quieter ride with consistent gear engagement, even on steep climbs or rugged descents.
This derailleur is compatible with Shimano 12-speed drivetrains and supports up to a 10-51T cassette thanks to its SGS long cage design. Built from lightweight, high-strength alloys with fluorine-coated bushings for reduced friction, the Shimano GRX Di2 RD-RX827 ensures efficient, reliable performance ride after ride.
- Wireless electronic shifting – clean, precise gear changes with Shimano Di2
- Shadow ES technology – ultra-low profile, skid-plate design for maximum clearance
- Dual spring chain stabiliser – reduces chain slap, improves stability on rough terrain
- Compatible with 12-speed drivetrains – designed for gravel, adventure & cyclocross bikes
- Supports wide-range gearing – fits 10-51T cassettes (SGS long cage)
- Lightweight & durable construction – cold-forged alloy links, rigid pulley cage
- 13T solid pulleys – improved chain wrap and smoother gear transitions
- Crash recovery function – absorbs impact and returns to position
- Zero-maintenance Shadow ES system – consistent performance over time
- Connectivity – BLE & ANT private for seamless integration
The Shimano GRX Di2 Rear Derailleur is specifically designed for gravel and cyclocross riding. It delivers stable, quiet, and precise shifting in all conditions, and handles modern wide-range gearing up to 51T single chainring setups. It is built with rugged reliability for demanding off-road adventures, and backed by Shimano’s world-class Di2 wireless technology.
The Shimano GRX Di2 RD-RX827 12-Speed Rear Derailleur (Shadow ES, SGS Long, 51T compatible) is the ultimate upgrade for gravel and adventure riders seeking flawless wireless shifting, maximum drivetrain stability, and lightweight durability on the toughest terrain.