Shimano GRX Di2 12-speed electronic gravel groupset RX827

The Shimano GRX Di2 RX827 is the definitive choice for the uncompromising gravel pioneer and bikepacker. Designed to bridge the gap between high-performance road electronic shifting and rugged mountain bike durability, the RX827 introduces a fully wireless derailleur interface that eliminates the risk of snagged wires in dense brush. It is built for the "adventure-first" rider who demands a massive gear range and the absolute reliability of electronic shifting when conditions get messy. Featuring an ultra-robust rear derailleur with mountain-bike-derived impact protection, this groupset is as much at home on a 200-mile gravel race as it is on technical singletrack.

Key Features

• Fully Wireless 1x Drivetrain: The first Shimano drop-bar system to feature a completely wireless connection between the shifters and the rear derailleur, streamlining frame compatibility and aesthetics.

   

• Automatic Impact Recovery: The RD-RX827 rear derailleur features a high-tech "recovery" mode; in the event of a rock strike, the motor disengages and instantly resets to protect the internal electronics and maintain shifting alignment.

   

• Shadow ES (Electronic Stabilization): An evolution of the chain-clutch system, Shadow ES provides superior chain retention on high-vibration terrain while maintaining the ultra-light lever feel of Di2.

   

• MTB-Grade Range: Optimized for use with 10-45T and 10-51T cassettes, providing "granny gears" that make even the steepest, loosest backcountry climbs manageable.

   

• Optimized Hood Geometry: The RX825 levers (used in this set) offer a raised head and ribbed texture for a secure grip during aggressive descents, even in the wet.

   

Specifications

• Drivetrain Speed: 1x12-Speed

   

• Shifting Type: Electronic (Fully Wireless)

   

• Braking Type: Hydraulic Disc Brake

   

• Cassette Interface: Micro Spline (Required for 10T small cog)

• Connectivity: Bluetooth® LE / ANT+ (Customizable via E-TUBE PROJECT App)

   

Typical Components Included

• ST-RX825 Di2 Wireless Dual Control Levers (Right: Shift/Brake, Left: Brake-only or programmable)

   

• RD-RX827-SGS Wireless Rear Derailleur

   

• FC-RX820-1 Hollowtech II Crankset

   

• CS-M8100 12-Speed Cassette (10-51T or 10-45T)

   

• CN-M8100 12-Speed Chain

   

• BR-RX820 Hydraulic Disc Brake Calipers

   

• RT-CL800 Centerlock Disc Rotors (160mm)

   

• BT-DN320 Integrated Rear Battery & EC-DN100 Charging Cable