(949) 535-3742
Shimano GRX RD-RX825 12-Speed Di2 Rear Derailleur
May 29, 2025MPN: IRDRX825A
$445.00
Shimano Di2 rear derailleur for GRX 12-speed drivetrains
Only 1 left in stock – Ships today! (Monday)
We offer free shipping on orders in the U.S. of $75 or more.
We also ship fast! In stock orders placed before 4 pm PT almost always ship the same day!
Shop with confidence! We offer a simple, 30-day policy where you can return new, unused items for a refund, exchange or store credit.
Shimano GRX RD-RX825 12-Speed Di2 Rear Derailleur
The Shimano GRX RD-RX825 12-Speed Di2 Rear Derailleur is a wireless rear derailleur that brings reliable and smooth shifting to your GRX drivetrain. Using Shimano’s Di2 technology, you can customize shift controls and charge your Di2 system with an easy to access port. Made to be dependable on mixed terrain, this rear derailleur features SHADOW RD+ and a stabilizer switch. Both of these features help ensure reliable shifting on rough surfaces. SHADOW RD+ minimizes chain slap and noise from your drivetrain while the stabilizer switch provides additional chain tension for bumpy and rough terrain. In addition, the stabilizer switch can easily be moved between ON and OFF based on the type of surface you are riding on. This derailleur uses sealed bearings for extra protection against the elements and is offered in a single derailleur cage length. It works with 11-34T and 11-36T cassettes.
Technology
Shimano’s SHADOW RD+
SHADOW RD+ helps minimize drivetrain noise while improving shift quality on rough terrain. The chain stabilizer system helps improve chain tension so you can shift gears regardless of terrain.
Stabilizer Switch
Easily move this switch ON or OFF based on your terrain. For rough surfaces, turn the stabilizer ON to keep shifting crisp and reduce the chances of damaging your derailleur.
Shimano Di2 Wireless Shifting
Bring wireless shifting and customization to your GRX 12-speed drivetrain.
Other Versions to Consider
Shimano GRX RX820 Mechanical 12-Speed Rear Derailleur: We also carry the non-Di2 Shimano GRX RD-RX820 12-Speed Rear Derailleur.
Compatibility
- Drivetrain: Compatible with Shimano GRX Di2 12-speed drivetrains.
- Cassette: Works with 11-34T and 11-36T cassettes.
Shimano GRX RD-RX825 Rear Derailleur Specs
- Speed: 12-speed
- Color: Black
- Weight: 310 grams
Q&A
Have a question about this? Ask the staff.
OTHER CUSTOMERS ALSO VIEWED
-
Features a carbon derailleur cage and delivers quick and reliable shifting -
A feature packed Shimano GRX 12-speed mechanical rear derailleur -
The perfect balance of price and performance -
Faster shifting than ever before
THIS PRODUCT IS FREQUENTLY BOUGHT WITH
-
Shimano's Ultegra 12-speed road cassette for Di2 and mechanical groupsets -
Shimano Ultegra/XT-level chain. Compatible with all 12-speed road and MTB drivetrains including e-Bikes -
Shimano GRX RX820 2x Crankset$224.992x Shimano 12-speed crankset for your gravel or cyclocross bike -
Shimano Di2 front derailleur for GRX 12-speed drivetrains
There are no reviews yet.