The Shimano GRX RX815 Di2 2x11 brings precision electronic shifting to the gravel world — combining gravel-optimised ergonomics, wide-range gearing and reliable hydraulic disc braking in one complete, trail-ready package. Whether you're grinding forest roads or racing mixed terrain, the GRX Di2 delivers Shimano's best electronic drivetrain performance with the durability and versatility gravel riding demands.

Highlights

Di2 Electronic Shifting

GRX Di2 delivers the digital precision Shimano's electronic drivetrains are renowned for — fast, accurate shifts under load, every time. Synchronized Shifting lets you concentrate on the ride: one lever trigger handles both front and rear derailleurs automatically, keeping you in the optimal gear ratio without manual front shifting. The system is also fully programmable via Shimano's E-Tube Project app, allowing custom shift configurations to suit your riding style.

Gravel-Optimised Controls & Braking

The ST-RX815 lever hoods are shaped specifically for gravel riding — higher and broader than road levers, with a recessed finger notch that keeps your hands secure over rough surfaces. SERVOWAVE brake lever technology provides progressive braking feel with strong initial bite and smooth modulation, while the BR-RX810 calipers with Ice Tech heat dissipation manage braking temperatures on long descents. The Shadow RD+ clutch on the rear derailleur prevents chain slap and derailment on technical terrain.

Gearing & Drivetrain

The 48/31T double chainring setup delivers a wide gear range suited to loaded touring and technical gravel climbing, while keeping top-end speed for faster surfaces. The rear derailleur handles cassettes from 11-30T up to 11-34T (the included CS-HG800 11-34T), giving a total capacity of 38 teeth. The FC-RX810 crankset uses a wider Q-factor than road cranks for a more natural pedalling stance on longer days in the saddle.

Compatibility & Fit

The GRX RX815 Di2 groupset is compatible with 11-speed Shimano drivetrains. The front derailleur is braze-on mount with a maximum front chainring of 50T. Brake calipers are flat-mount disc only — rotors are sold separately (140mm or 160mm recommended). Crank arm lengths available: 170mm, 172.5mm, and 175mm. Bottom bracket is English or Italian threaded (BB-R60 included). Di2 wiring lengths may need to be matched to your frame — additional E-Tube wires are sold separately if required. Rotors and a Di2 charging cable are not included.

Also in this kit

Optional parts

Shimano GRX Di2 components are covered by a 2-year warranty against defects in materials and workmanship from the date of original retail purchase. This warranty covers manufacturing defects and does not extend to damage caused by misuse, improper installation, normal wear, or failure to follow Shimano's maintenance guidelines.

For warranty support, return the item to Tune Cycles.

  • 2x11-speed Di2 electronic groupset for gravel and adventure riding
  • ST-RX815 Di2 hydraulic shift/brake levers with gravel-specific raised hood ergonomics
  • SERVOWAVE brake technology for progressive, confident braking modulation
  • BR-RX810 flat-mount hydraulic disc brake calipers with Ice Tech heat dissipation
  • FC-RX810-2 crankset — 48/31T chainrings, wider Q-factor for all-day comfort
  • RD-RX815-GS Di2 rear derailleur — Shadow RD+ clutch, medium cage, up to 34T max sprocket
  • FD-RX815 Di2 front derailleur — braze-on mount, 50T max chainring
  • Synchronized Shifting for simplified automatic front/rear coordination
  • CS-HG800 11-speed cassette (11-34T) included
  • CN-HG701-11 11-speed chain included
  • BT-DN110A-7 internal Di2 battery included
  • BB-R60 bottom bracket included
  • Pre-bled brake hoses for straightforward installation
  • Compatible with Shimano E-Tube Project app for custom shifting configuration
Component Specification
Speeds 2x11
Shifters Shimano ST-RX815 Di2 Hydraulic
Brake Calipers Shimano BR-RX810, Flat Mount, Hydraulic Disc
Crankset Shimano FC-RX810-2, 48/31T
Crank Arm Lengths 170mm, 172.5mm, 175mm
Chainline 46.9mm
Front Derailleur Shimano FD-RX815 Di2, Braze-On, Max 50T
Rear Derailleur Shimano RD-RX815-GS Di2, Shadow RD+, Medium Cage
Rear Derailleur Capacity 38T total
Max Sprocket 34T
Cassette Shimano CS-HG800, 11-34T, 11-speed
Chain Shimano CN-HG701-11, 116 Links
Bottom Bracket Shimano BB-R60 (English or Italian thread)
Battery Shimano BT-DN110A-7 Internal Di2 Battery
Brake Mount Flat Mount
Rotor Compatibility 140mm / 160mm (rotors sold separately)
Drivetrain Type Wired Di2 Electronic
SKU SHM-RX815-2-GROUP
Barcode #
Brand Shimano
Shipping Weight 0.3000kg
Shipping Width 0.160m
Shipping Height 0.060m
Shipping Length 0.220m

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