ROSE Bikes GRX Di2 ST-RX825-R Brake/Shift Lever Combination Rear Wheel with BR-RX820 Disc Brake, J-Kit Direct| Disc Brakes

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 ST-RX825 brake/shift lever combination, SHIMANO not only supports the new 12-speed gravel drivetrains, but also cuts the cable connection to the rear derailleur and front derailleur, as it did with the road bike groupsets.
An integrated radio transmitter, powered by two CR1632 button cells, sends the shifting commands wirelessly to the rear derailleur as the master unit, which in turn forwards them to the front derailleur. The complex cabling in the cockpit area with junction box and Bluetooth module is now a thing of the past.

Thanks to the raised hoods, a textured surface and an anti-slip coating, the ergonomic brake lever offers more security and control. Its design is ideal for flared handlebars, which are becoming increasingly popular in the gravel sector.  

Details:
Dual Control shift/brake lever combination for SHIMANO Di2 Gravel 2×12-speed gears
Electronic Di2 shifting system for fast, intuitive and high-performance gear shifting
Supports wireless shifting with compatible Di2 components
Di2 wireless chip with low interference, high processing speed and low power consumption
Battery-powered: no cables needed in the cockpit
Hydraulic disc brake system
Constantly high braking power with little effort – even in bad weather conditions
Excellent lever ergonomics
SERVO-WAVE technology for maximum braking performance and outstanding braking power modulation
FUNNEL BLEEDING for quick and easy bleeding
REACH ADJUST lever reach adjustment
FREE STROKE ADJUST bite point adjustment
J-KIT DIRECT version: filled ready for mounting and bled for easy cutting and routing of the cable*

Technical details:
Intended use: Gravel, Road, Cyclocross
Series: GRX Di2
Material: aluminium, glass fibre composite
Compatibility: SHIMANO Di2 connectivity wireless
Programmable gear steps
Brake lever: ST-RX825-R (rear wheel: right lever)
Brake calliper: BR-RX820 (Flatmount, 2-piston system (resin), flat design)
Brake hose: SM-BH90-JK-SSR
Brake fluid: SHIMANO mineral oil
Adjustable free stroke: yes
Lever reach adjustment integrated (with tool)
Hose length: 1700 mm (rear wheel)
Brake pads: L05A-RF Ice Tec (with cooling fins), organic
Recommended disc rotor: SHIMANO RT-CL800
Slots: 1 SD300 E-Tube port**, 1 SD300 port for optional satellite switches
Battery: CR1632 (2x)
Weight brake levers: approx. 415 g (pair)
Weight brake calliper: approx. 122 g

In the box:
1 SHIMANO GRX Di2 ST-RX825-R STI brake/shift lever
1 SHIMANO GRX BR-RX820 brake calliper for rear wheel incl. 1 set of brake pads and insert
1 SHIMANO SM-BH90 brake hose (1700 mm)  

*Note:
The J-Kit comes pre-filled and, thanks to the pre-installed olive, allows for easy cutting of the cables as well as cable routing inside the frame, too. Additional bleeding is therefore generally unnecessary.

**Note:
The shift lever only supports wireless shifting!
Wired installation is NOT supported. The existing SD300 E-Tube port is only intended for wired pairing and/or firmware updates!