SHIMANO GRX RD-RX825 Di2 Rear Derailleur, 12-speed

United in Gravel!
With a clear focus on the heart and soul of gravel biking, SHIMANO's electronic GRX series now gets a 12-speed update to deliver top performance!
Simplicity and reliability build the basis for the new 12-speed GRX line-up and allow you to enjoy off-road adventures of a special kind!

With the GRX Di2 RX825 12-speed rear derailleur as the master unit, the Japanese branch giant brings proven and reliable technologies to your gravel racer.
For example, the ingenious developers at SHIMANO have taken inspiration from the mountain bike sector and integrated the tried-and-tested Shadow RD+ technology. The forward and reverse movement of the RD-RX825 Di2 rear derailleur is slowed down considerably by the selectable friction damper. This significantly reduces the risk of chain bouncing and jump off and shifting into the wrong gear, while significantly reducing chain noise.
This guarantees silent, smooth, precise and reliable electronic gear changes in challenging terrain. Whether riding off tarmac roads and on dusty gravel roads, going on a bikepacking adventure with lots of luggage, doing classic cyclocross or simply commuting to work.

Details:
• Wireless electronic 12-speed rear derailleur
• Di2 wireless chip with low interference, high processing speed and low power consumption
• Shadow RD+ technology (friction damper)
• Compatible with Direct Mount
• 4 fluorine-coated joint bushings
• SD300 E-Tube Port: slimmer cables for less weight and easier routing
• Bluetooth LE compatible: can be wirelessly customised via E-Tube app for smartphone & tablet
• Compatible with ANT+: transmission of data (e.g. current gear) to compatible bike computers
• Status LED for system information and battery level displays at the touch of a button
• Splash-proof charging port for charging the central Di2 system battery
• Also suitable for wired setup

Technical details:
• Intended use: Gravel, Road, Cyclocross
• Series: GRX Di2
• Material: aluminium, fibreglass composite, stainless steel, steel
• Compatibility: SHIMANO Di2 connectivity wireless, SHIMANO Di2 connectivity wired
• Gears: 12-speed
• Largest sprocket max.: 36 teeth
• Largest sprocket min.: 34 teeth
• Smallest sprocket max.: 11 teeth
• Smallest sprocket min.: 11 teeth
• Max. front difference: 17 teeth
• Total capacity: 40 teeth
• Compatible chains: SHIMANO HG 12-speed
• Slots: 1 EW-SD300 E-Tube port, 1 EW-EC300 charging port
• Function key: yes
• Weight: approx. 310 g

In the box:
• 1 SHIMANO GRX RD-RX825 Di2 rear derailleur