描述
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
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 SPECIFICATION
| Model No | RD-RX825 | |
| Series | GRX | |
| Rear speeds | 12 | |
| RD construction | SHIMANO SHADOW RD+ | ✔ |
| Mount | Direct attachment (conventional) | ✔ |
| Direct mount | ✔ | |
| Max. front difference | 17T | |
| Total capacity | 40T | |
| Low sprocket | Max. | 36T |
| Min. | 34T | |
| Top sprocket | Max. | 11T |
| Min. | 11T | |
| Fluoric coated link bushings | 4 | |
| Pulley | Guide pulley bearing | Sealed bearing |
| Tension pulley bearing | Sealed bearing | |
| Teeth | 11T/13T | |
| Sunken type pulley screw | ✔ | |
| B-axle | Hollow axle | ✔ |
| B-axle 2 | Hollow axle | ✔ |
| Di2 connectivity wired | Di2 shifting | ✔ |
| Di2 connectivity wireless | Di2 shifting | ✔ |
| Bluetooth® LE custom (*1)|Adjust mode information | ✔ | |
| Bluetooth® LE custom (*1)|Di2 battery level | ✔ | |
| Bluetooth® LE custom (*1)|Gear position | ✔ | |
| Bluetooth® LE custom (*1)|SHIMANO E-BIKE SYSTEMS data items (*3) | ✔ | |
| Bluetooth® LE custom (*1)|Compatible with E-TUBE RIDE | ✔ | |
| Bluetooth® LE custom (*1)|Compatible with E-TUBE PROJECT | ✔ | |
| ANT private (*2)|Adjust mode information | ✔ | |
| ANT private (*2)|Di2 battery level | ✔ | |
| ANT private (*2)|Gear position | ✔ | |
| ANT private (*2)|SHIMANO E-BIKE SYSTEMS data items (*3) | ✔ | |
| Firmware update by E-TUBE PROJECT | ✔ | |
| SD50 port (pcs) | 0 | |
| SD300 port (pcs) | 1 | |
| SD50 connector (pcs) | 0 | |
| SD300 connector (pcs) | 0 | |
| LED for system status | ✔ | |
| Charging cable | EW-EC300 | |
| Remarks | w/o Bracket spec. available | |
| Color | Series color | |
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