Shimano GRX RD-RX827 12S Rear Derailleur

• Fully wireless shifting built for rough gravel terrain
• Robust Design: A wide link structure, skid-plate design, durable aluminum plate and solid pulley add robustness and longevity
• RD Protection Function: The new Automatic Impact Recovery function instantly returns the derailleur to its original position after impact
• SHIMANO SHADOW ES: A slimmer, stronger evolution of SHIMANO's pioneering chain-stabilizing SHADOW RD+ concept
• Protected Battery: Tucked safely inside an enclosed space, the battery won't budge even in rough terrain, while remaining easily removable for charging