SHIMANO GRX Di2 RX825 2 x 12 speed Groupset



4 in stock


Electrifying Shimano’s 12-speed gravel component family, the new 2 x 12-speed GRX RX825 Di2 components combine Shimano’s unrivaled electronic shifting with optimized gearing options for riding, racing, and all-day adventures.

The new suite of electronic Di2 parts features dual control levers refined for comfort and control, a SHIMANO SHADOW RD+ equipped rear derailleur for better chain management, and a gravel-optimized front derailleur for precise shifting.

Designed for gravel riders who live to be in the moment, who venture down lonely, unknown dirt roads, who take on routes and races with unpredictable outcomes, Shimano GRX 12-speed Di2 delivers precise, reliable, distraction-free performance in all conditions.

Unrivaled Shimano Di2 Electronic Shifting for Gravel

Like its 12-speed DURA-ACE, ULTEGRA, and SHIMANO105 Di2 siblings, the new GRX Di2 system is wired where it makes sense, featuring a central, multi-port battery that supplies stable, long-lasting power to both front and rear derailleurs. Smaller diameter wires connect directly from the battery to each derailleur, eliminating the need for junctions and streamlining the build process. The central internal battery also simplifies charging and remains secure over the roughest roads, trails, or whatever less traveled path a rider may choose.

Shimano Di2 Wireless Cockpit
Shimano’s12-speed GRX Di2 features a wireless gravel-specific cockpit where raised hoods with ribbed surface texture and anti-slip brake levers provide ultimate hand security no matter how spicy the ride gets. That secure hand position is enhanced, as it was with the original GRX RX815 Di2 DUAL CONTROL LEVERS, with the location of the third Di2 button on the inside of the hood. Whether used as another shift location or for scrolling through screens on a cycle computer, this third button is another way to fully experience Shimano’s electronic Di2 system.


Using Shimano’s E-TUBE PROJECT Cyclist application, riders can choose between different gear shift intervals for multi-shift, customize shift button assignment (what buttons perform which functions), program different automatic shift modes like Synchronized and Semi-Synchronized shifts, and fine-tune shifts.

The launch of RX825 also coincides with the debut of Shimano’s new FRONT SHIFT NEXT functionality. With this firmware update, you can now utilize Shimano’s user-friendly E-TUBE PROJECT Cyclist app to program any 12-speed Di2 button to shift the front derailleur to whichever chainring you are not currently using and then toggle back and forth using the same button. This new firmware is compatible not only with GRX RX825, but also with Shimano’s family of 12-speed road Di2 groups.

Groupset includes:

  • ST-RX825 GRX DISC BRAKE SET (left and right shifter and brake, pre-bled)
  • FC-RX820-2 GRX CRANKSET – 2X12 SPD
  • CS-R8101 ULTEGRA CASSETTE (11-30 or 11-34) or CS-HG710-12 CASSETTE 12 SPEED (11-36)
  • EW-SD300 ELECTRIC WIRE (900mm and 1200mm)
  • Optional add on:
  • Groupset weight: 2892 grams





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