Shimano GRX Di2 12-speed electronic gravel groupset  RX825 

The Shimano GRX RX825 Di2 groupset is the ultimate electronic drivetrain for gravel racers and adventure cyclists who refuse to compromise on precision or reliability. Engineered specifically for the 12-speed era, this semi-wireless groupset combines the lightning-fast shifting of Di2 technology with gravel-specific ergonomics. Its raised hood design and anti-slip lever coating ensure total control on technical descents, while the wireless cockpit eliminates messy cabling for a clean, aerodynamic front end. Whether you’re competing in a multi-day ultra-endurance race or exploring remote backcountry trails, the RX825 delivers a "uniquely gravel" experience that remains silent, secure, and effortless under any load.

Key Features

• Wireless Cockpit: Powered by coin-cell batteries in the shifters, the system communicates wirelessly with the rear derailleur, simplifying frame compatibility and installation.

• Front Shift Next: Utilizing the E-TUBE PROJECT app, you can program any Di2 button to toggle the front derailleur, making shifting more intuitive during high-intensity efforts.

• Gravel-Optimized Ergonomics: Shifter hoods feature a flared profile and textured surface designed to integrate perfectly with flared gravel handlebars.

• Shadow RD+ Stabilizer: The integrated clutch on the rear derailleur prevents chain slap and drops on rough terrain, with a simple ON/OFF switch for wheel changes.

• Third Button Functionality: Each hood features a customizable "third button" on the inside, which can be programmed to shift gears or control compatible GPS head units.

Specifications

• Drivetrain Speed: 2x12-Speed (Only)

• Shifting Type: Electronic (Di2 Semi-Wireless)

• Braking Type: Hydraulic Disc Brake

• Connectivity: Bluetooth® LE / ANT+ (E-Tube Project App)

• Charging: Integrated port on the rear derailleur

Typical Components Included

• ST-RX825 Dual Control Shifters (Left & Right)

• FD-RX825 Di2 Front Derailleur

• RD-RX825 Di2 Rear Derailleur

• FC-RX820-2 Crankset (48/31T)

• CS-HG710-12 or CS-R8101 Cassette

• CN-M8100 12-Speed Chain

• BR-RX820 Hydraulic Disc Brake Calipers

• BT-DN300 Internal Battery & Charging Cable