The Shimano GRX Di2 FD-RX825 brings electronic precision to gravel riding, delivering fast and reliable front shifts even under load. Engineered as part of the flagship 2x12-speed GRX Di2 groupset, it's designed for gravel riders who demand the smooth, predictable performance of Di2 technology on mixed terrain and long-distance adventures.

Highlights

  • Electronic Di2 shifting: Instant, precise front shifts at the push of a button — no manual cable tension adjustments needed.
  • 47mm chain line: Offset 2.5mm wider than standard 12-speed road derailleurs to improve tyre clearance on gravel and adventure framesets.
  • 17T total capacity: Handles the wide gear range typical of gravel riding, supporting chainring combinations up to 48T.
  • Braze-on mount: Clean, direct-mount attachment for a lightweight and tidy install on braze-on compatible frames.
  • Synchronised shifting modes: Compatible with Full Sync and Semi-Sync modes via E-TUBE PROJECT Cyclist app — the rear derailleur automatically compensates when you shift the front.
  • FRONT SHIFT NEXT function: Program any Di2 button to shift the front derailleur, giving you greater flexibility in how you control your gearing.
  • E-TUBE connected: Features one SD300 port for wired integration into the GRX Di2 system with firmware updatable via E-TUBE PROJECT.

GRX Di2 System Integration

The FD-RX825 is built to pair with the complete GRX 12-speed Di2 ecosystem, including the ST-RX825 dual-control levers, RD-RX825 rear derailleur, and GRX 12-speed cranksets. The centralised multi-port battery supplies stable power to both derailleurs for long ride reliability. Like Dura-Ace and Ultegra Di2, adjustments are made electronically — eliminating cable stretch and trim adjustment over time.

Compatibility & Fit

The FD-RX825 is a 12-speed Di2 front derailleur with a braze-on mount. It operates on a 47mm chain line and supports a total gear capacity of 17T, with compatible outer chainring sizes of 46–48T — pairing directly with the FC-RX820 (48/31T) and FC-RX610 (46/30T) cranksets. It is compatible with Shimano 12-speed E-TUBE Di2 systems. Not compatible with mechanical shifting or 11-speed drivetrains.

Shimano offers a limited warranty covering defects in materials and workmanship. For warranty support, return the item to Tune Cycles.
  • Electronic Di2 shifting — fast, precise front shifts with no cable tuning
  • 47mm chain line for increased tyre clearance on gravel frames
  • 17T total capacity, supports 46–48T outer chainrings
  • Braze-on mount for a clean, lightweight installation
  • Full Sync and Semi-Sync shifting modes supported
  • FRONT SHIFT NEXT function — assign front shifting to any Di2 button
  • 1x SD300 E-TUBE port for wired system integration
  • Firmware updatable via Shimano E-TUBE PROJECT Cyclist app
ModelFD-RX825
SeriesGRX Di2 12-Speed
Shifting TypeElectronic Di2
Speeds12-speed
Mount TypeBraze-on
Chain Line47mm
Total Capacity17T
Compatible Outer Chainring46–48T
E-TUBE Ports1x SD300
Weight142g
Cage Pull DirectionDown swing / top pull
SKU SHM-IFDRX825F
Barcode # 4550170310646
Brand Shimano

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