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SHIMANO's GRX Di2 12-speed rear derailleur features a built-in wireless connectivity unit and charging port, ensuring fast and reliable shifting for mixed-terrain riding and easy recharging.
Shimano GRX Di2 2x12sp RD-RX825 Direct Mount Rear Derailleur
SHIMANO's GRX Di2 12-speed rear derailleur features a built-in wireless connectivity unit and charging port, ensuring fast and reliable shifting for mixed-terrain riding and easy recharging.
IRDRX825A
€359.99
€323.99
Save 10%
VAT included
You save €36.00 (10%) on the manufacturer's recommended price
Price history
- Today's price
- €323.99
- Lowest price of the last 30 days
- €323.99
- Manufacturer's recommended price
- €359.99 (10% less)
The price has not been reduced in the last 30 days. The recommended price is set by the manufacturer and is shown for reference only.
FREE SHIPPING IN ITALY FROM 129,99 EUROS*
100% SECURE CHECKOUT
N.1 in Italy in the Bike and E-Bike Shops
SHIMANO's GRX Di2 12-speed rear derailleur features a built-in wireless connectivity unit and charging port, ensuring fast and reliable shifting for mixed-terrain riding and easy recharging. Integrated SHADOW RD+ technology prevents chain slap and ensures precise shifting even on rough terrain. Thanks to built-in ON/OFF switch, wheel removal is easy too. The RD-RX825 is compatible with 11-34T and 11-36T 12-speed cassettes and supports Full or Semi-Synchronized shift modes, enhancing rider customization.
BENEFIT
Compact design with integrated wireless unit, charging port, and switch
Fast and reliable shifting on rough terrain
Gravel-tuned clutch tension
LED status indicator
Top sprocket: Max. 11T/Min. 11T
Low sprocket: Max. 36T/Min. 34T
Total capacity: 40T
FEATURE
Adjustable chain stabilizer prevents chain slap
SHIMANO SHADOW RD+
Switch stabilizer ON/OFF to match terrain: ON for gravel, OFF for smooth roads
Battery indicator, pairing, adjust mode, etc.
PRODUCT SPECIFICATIONS
Model No: RD-RX825
Series: GRX
Rear speeds: 12
RD construction: SHIMANO SHADOW RD+: Yes
Mount: Direct attachment (conventional): Yes
Direct mount: Yes
Max. front difference: 17T
Total capacity: 40T
Low sprocket: Max.: 36T / Min.: 34T
Top sprocket: Max.: 11T / Min.: 11T
Fluoric coated link bushings: 4
Guide pulley bearing: Sealed bearing
Tension pulley bearing: Sealed bearing
Teeth: 11/13T
Sunken type pulley screw: Yes
B-axle: Hollow axle: Yes
B-axle 2: Hollow axle: Yes
Di2 connectivity wired: Di2 shifting: Yes
Di2 connectivity wireless: Di2 shifting: Yes
Bluetooth® LE custom (*1)|Adjust mode information: Yes
Bluetooth® LE custom (*1)|Di2 battery level: Yes
Bluetooth® LE custom (*1)|Gear position: Yes
Bluetooth® LE custom (*1)|SHIMANO E-BIKE SYSTEMS data items (*3): Yes
Bluetooth® LE custom (*1)|Compatible with E-TUBE RIDE: Yes
Bluetooth® LE custom (*1)|Compatible with E-TUBE PROJECT: Yes
ANT private (*2)|Adjust mode information: Yes
ANT private (*2)|Di2 battery level: Yes
ANT private (*2)|Gear position: Yes
ANT private (*2)|SHIMANO E-BIKE SYSTEMS data items (*3): Yes
Firmware update by E-TUBE PROJECT: Yes
SD50 port (pcs): 0
SD300 port (pcs): 1
SD50 connector (pcs): 0
SD300 connector (pcs): 0
LED for system status: Yes
Charging cable: EW-EC300
Remarks: w/o Bracket spec. available
Color: Series color
IRDRX825A
Data sheet
- Speeds
- 12
- Code
- SH241024
- Compatible with
- Shimano
- Type
- Electronic
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Who it is for and how to use it
Ideal for
Gravel on mixed terrain
Designed for riders using a gravel bike on mixed and rough terrain. SHADOW RD+ technology helps keep shifting precise and reduces chain noise.
Anyone looking for a 12-speed Di2 electronic rear derailleur
Suitable for those wanting a Shimano electronic rear derailleur with Di2 standard and 12-speed. Wireless connectivity and integrated charging simplify everyday use.
Anyone using 11-34D or 11-36D cassettes
Suitable for those fitting Shimano 11-34D or 11-36D cassettes. The stated compatibility covers both 12-speed configurations.
Use cases
Ideal
Gravel rides on uneven surfaces
The SHIMANO SHADOW RD+ structure and the Gravel-adjusted clutch tension help keep shifting precise on rough terrain.
Gravel · Terreni accidentati · SHIMANO SHADOW RD+
Very suitable
Bike with Di2 electronic shifting
Di2 wired and wireless connectivity, together with the integrated charging port, makes the system suitable for a modern electronic build.
Di2 · Wireless · Ricarica integrata
Very suitable
Use with 12-speed 11-34D and 11-36D cassettes
The rear derailleur is compatible with 11-34D and 11-36D cassettes in 12-speed, so it suits different gravel gearing setups.
12 velocità · Cassette 11-34D · Cassette 11-36D
Suitable
Rear wheel handling
The built-in ON/OFF switch makes wheel removal easier and allows the stabiliser to be adapted to the terrain.
Interruttore ON/OFF · Ruota posteriore · Stabilizzatore
Who it is for
Experienced gravel rider
- Looks for
- Electronic Shimano Di2 rear derailleur in 12-speed for mixed and rough terrain.
- Why
- Offers SHADOW RD+, wireless connectivity and compatibility with 11-34D and 11-36D cassettes.
Anyone upgrading a Shimano 12-speed drivetrain
- Looks for
- A rear derailleur compatible with Shimano, Di2 and direct attachment mounting.
- Why
- The stated compatibility and direct attachment mounting make it consistent with a Shimano 12-speed drivetrain.
Frequently asked questions
What speeds is this rear derailleur compatible with?
It is a 12-speed rear derailleur. The specification lists compatibility with Shimano 11-34D and 11-36D 12-speed cassettes.
Is it electronic?
Yes, it is an electronic Shimano Di2 rear derailleur. The specification also lists wireless and wired Di2 connectivity.
Does it support 36D cassettes?
Yes, it supports cassettes up to 36D. Compatibility lists 11-34D and 11-36D.
What advantage does SHIMANO SHADOW RD+ offer?
SHADOW RD+ technology helps reduce chain noise and keeps shifting precise on rough terrain.
Is the charging unit integrated?
Yes, the specification lists an integrated charging port and EW-EC300 charging cable. This simplifies Di2 system management.
Show all (6)
Does it have direct mount installation?
Yes, the specifications indicate direct mount installation. The specification also notes no hanger.
Information prepared by the BSA team with the support of AI, based on the manufacturer's specifications.