Shimano GRX 827 Di2 1x12-Speed Gravel Groupset

Shimano GRX RX827 Di2 Wireless Gravel Groupset - 1x12 Speed Introducing GRX RX827 1x12 Wireless Di2 groupset. Shimano marks its debut in the fully wireless drop bar segment with the new 1x12-speed GRX Di2 components. Featuring robust MTB technologies, GRX RX827 delivers performance, durability, and versatility.
GRX 827 brings Di2 electronic shifting to 1× gravel bikes, offering precise and fast wireless shifts paired with hydraulic braking, ideal for adventure and off-road riding.

The system uses a wireless rear derailleur with internal battery and matches with a wide-range 10–51T cassette for climbing and fast terrain.

It also features gravel-specific ergonomics, customizable shifting via Shimano’s E-Tube app, and rugged design elements like Shadow ES chain stability and impact recovery technology.

The groupset does not include rotors.

Specification

Ideal for: top-level groupset for gravel riding, gravel racing, hilly terrain Wide gear ratio Performance and race-ready groupset for gravel riding, racing at great value Aligned to Shimano Ultegra road-level groupset 1x12-speed, disc brake, semi-wireless electronic groupset Rear derailleur is quick, smooth and effortless, for unmatched drivetrain efficiency Rear derailleur's compact design includes an integrated wireless unit, charger, and switch Button on the rear derailleur for Di2 operations, and LED light denotes synchronised shift mode, setting mode and charge requirements Rear derailleur wirelessly connects to the shifters Low profile Shadow derailleur design GRX/Ultegra wireless hydraulic Servo Wave disc brake Di2 STI levers give you control, modulation and power with minimal effort in all riding conditions Levers use CR1632 batteries which last for approximately 1.5-2 years  Hyperglide+ technology in the sprockets and chain improves shifting under load Rotors are sold separately

What's In The Box?

Shimano GRX ST-RX825 12-Speed Hydraulic Semi-Wireless Shifter Shimano GRX ST-RX820 Hydraulic Brake Lever  Shimano GRX BR-RX820 Flat Mount Hydraulic Callipers, pair Shimano GRX FC-RX820 12-Speed Double 1x Chainset Note: Chainset is available in a range of crank lengths and sizes, please select you size Shimano GRX RD-RX817 Di2 12-Speed Rear Derailleur with Battery Shimano CS-M7100 12-Speed Cassette, 11-51T Shimano CN-M6100 12-Speed Chain Shimano BB-R60 Ultegra Bottom Bracket Shimano Di2 BT-DN320 Battery Shimano Non-Series Di2 EC-DN100 Di2 wireless rear derailleur battery charger Shimano Hydraulic brakes are supplied with hoses, pre bled, ready for installation Brakes are set up with left lever/rear brake and right lever/front brake NOTE: The groupset is not supplied with Disc Brake Rotors or Di2 Charging Cable