Product Overview The Shimano GRX RD-RX827-SGS 12-Speed Rear Derailleur is engineered for maximum speed, range, and durability to handle tough gravel conditions. Designed to pair with a 10-51T cassette, it delivers fully wireless electronic shifting with robust impact protection.

Key Features

• Wireless Gravel Shifting: Delivers precise, fully wireless 1x12-speed Di2 shifting tuned specifically for rugged terrain.

• Automatic Impact Recovery: Features an active RD Protection function that automatically resets the rear derailleur to its original position immediately after taking an impact.

• SHIMANO SHADOW ES Technology: A sleeker, tougher evolution of Shimano's chain stabilization system designed to reduce chain bounce and increase tension.

• Rugged & Durable Construction: Built with a wide link design, Skid Plate structure, durable aluminum alloy plates, and solid pulley wheels to withstand harsh impacts and prolong component life.

• Protected Battery Enclosure: Features a securely enclosed battery bay that keeps the battery locked in place over rough trails while allowing quick access for recharging.