Shimano GRX RX827 Di2 wireless rear derailleur - 1x12 Speed for Micro Spline cassette

Genuine boxed Shimano component fully guaranteed

The all-new GRX RX827 rear derailleur paired with a 10-51T cassette gives riders and racers the speed, range, and robustness to pursue any gravel challenge. With built-in automatic impact recovery, an impact-deflecting shape, and solid pulleys, this derailleur stands up to hard impacts and still retains its lightning-quick shifting performance.

• Shimano GRX, with its gravel specific ergonomics, optimized gearing options, rugged reliability, and quiet and stable drivetrain, sets itself apart from the rest of the component world
• Precise and clean wireless shifting with Integrated on-board removable battery (BT-DN320 additional option)
• The integrated removable on-board battery is protected within the linkage
• Crash recovery function, absorbs impacts and returns to its original position
• Connectivity BLE, ANT private
• Shadow ES features a super low profile skid plate design and optimized slant angle for optimal clearance
• Shadow ES uses a dual spring chain stabilising switch that when on will reduce chain bounce in rough terrain maintaining more stable drive and shifting
• The Shadow ES system is also zero maintenance and has no degradation of performance
• Unique structure using two springs has a tighter chain wrap that improves shifting and security with increased spring force by 70%, allowing the chain to mesh firmly with the sprocket
• With the tighter chain wrap skipping is prevented even as the cogs wear
• 13T solid pulleys and decreased derailleur tension prevent high chain tension in low gears
• Alloy outer and inner pulley cage saves weight and increases rigidity
• Cold forged wide alloy links and pivot body
• Fluorine-coated link pin bushings
• Specifically designed to work with 12-speed drivetrains
• 10-51 tooth compatible SGS cage