The Shimano GRX RX827 Di2 Wireless rear derailleur paired with a 10-51t cassette (cassette sold separate) 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.

Fully wireless shifting built for rough gravel terrain

A wide link structure skid-plate design durable aluminum plate and solid pulley add robustness and longevity

Automatic Impact Recovery function instantly returns the derailleur to its original position after impact

Features Shimano Shadow ES: A slimmer stronger evolution of Shimano's pioneering chain-stabilizing Shadow RD+ concept

Tucked safely inside an enclosed space the battery won’t budge even in rough terrain while remaining easily removable for charging

Largest Cog	51
Rear Der/Shifter Compatibility	Shimano Road Di2
Rear Derailleur Mount Type	10x1 Standard
Drivetrain Speeds	12
Chain Wrap Capacity (teeth)	41
Cage Length	Long
Color	Black