Shimano GRX RX827 Di2 12 Speed Groupset

The Shimano GRX RX827 Di2 12-speed groupset is made for gravel riders who value simplicity, precision and reliability. Its 1x drivetrain removes the front derailleur from the equation, creating a cleaner setup with less maintenance and more mud clearance when conditions get rough. At the same time, Shimano’s Di2 platform delivers fast, accurate shifting at the touch of a button.

At the heart of this setup is the GRX RX827 rear derailleur, developed for demanding gravel use. Shimano highlights its fully wireless design, protected battery placement and automatic impact recovery function, which helps the derailleur return to position after a hit. Combined with its low-profile construction and robust pulley design, it is built to keep performing when the ride gets technical.

This configuration combines a 42T crankset with a 10-51 cassette, giving you the range to spin up steep climbs while still maintaining speed on faster sections. Hydraulic disc brakes with 160 mm rotors front and rear provide powerful, controlled braking, making this groupset a strong choice for adventure riding, racing and demanding all-road use.

Another advantage is compatibility. Shimano states that RX827 does not require a special gravel frame or UDH-specific setup, making it easier to upgrade an existing bike to a modern wireless gravel drivetrain.

Key features

• 1x12 Shimano GRX Di2 gravel groupset
• Fully wireless shifting performance
• Clean drivetrain setup without a front derailleur
• Wide-range 10-51 cassette for climbing and speed
• 42T crankset for versatile gravel gearing
• Hydraulic disc brakes with 2 x 160 mm rotors
• Built for rough terrain with impact-focused derailleur design
• OEM packaged

Specifications

• Crankset: RX827, 170 mm, 42T
• Chain: CN-M8100, 118 links
• Cassette: CS-M8100, 10-51T
• Bottom bracket: Press Fit
• Rear derailleur: RD-RX827
• Shifters: RX820 / RX827
• Rotors: CL800, 160 mm, 2 pcs
• Configuration: GRX 827 | 170 | 42T | 10-51 | 2x 160 mm | Press Fit
• Packaging: OEM