The Shimano GRX RD-RX717 Wireless Di2 Rear Derailleur is designed to give gravel riders the durability and gear range to pursue any off-road exploration that tickles their fancy. This derailleurs wedge shaped body is filled with a low profile Shadow ES stabiliser that produces excellent chain retention and reduced chain slap over rough terrain, and the lower profile construction produces excellent clearance over trail obstacles. Because it is impossible to avoid all impacts, this derailleur is equipped with aluminum skid plates, a wide link structure, and a robust steel alloy pulley cage stuffed with solid pulleys for extra toughness, and this derailleur also has an integrated RD Protection function that will instantly return the derailleur to its original position after a strike happens.

As impressive as the tech put into the rear derailleur design is, perhaps the more impressive thing Shimano has done is to evolve their Di2 drivetrain so it can be used on more bikes. By eliminating much of the wiring that used to be housed within the bike's frame and tucking the battery within a fully encased compartment in the rear derailleur, a truly wireless system has been crafted which can be used on any road, adventure, and gravel bike. In addition to adding strength and reliability, the construction of this rear derailleur adds stiffness in key area's so shifts are incredibly crisp and precise. Last but not least, the long pulley cage is designed specifically for 1x12 speed drivetrains and has the capacity to use a super wide 10-51T cassette so there is plenty of gears on tap to go anywhere a rider wishes to go.

Note: Rear derailleur does not include the wireless Di2 Battery.

Long cage design allows for the widest 1x12 speed gear range possible for tackling any dirt road/path and technical terrain
Robust skid-plate design with a wide link structure incorporates a durable steel alloy pulley cage and solid pulleys for outstanding reliability and longevity
RD Protection Function returns the derailleur to its original position after an impact
Shadow ES evolves chain stabilization with a slimmer, stronger iteration
Wedge Shape adds additional ground clearance and deflects impacts from rocks or trail debris
Di2 battery is the same one used in RX827 GRX, M9250 XTR, and XT M8250 Di2 rear derailleurs, securely tucks within the derailleur body for protection, and is easily removed for recharging

Specifications
Speed: 12 Speed
Shifter Compatibility: Shimano Di2
Shift Mechanism: Electronic (Wireless)
Max. Tooth: 51T
Min. Tooth: 10T
Chain Wrap Capacity: 41T
Cage Material: Aluminum
Chain Retention: Shadow ES
Colour: Black
Weight: 494g