Shimano GRX Di2 12v RD-RX825 rear derailleur

SHIMANO's 12-speed GRX Di2 rear derailleur features integrated wireless connectivity units and charging port, ensuring fast and reliable gear changes on mixed terrain, and easy charging. Built-in SHADOW RD+ technology eliminates chain noise and ensures precise gear changes even on rough terrain. With a built-in ON/OFF switch, wheel removal is also simplified. The RD-RX825 rear derailleur is compatible with 11-34D and 11-36D 12v cassettes and supports fully or partially synchronized shifting modes for greater customization to individual needs.

Features

• Fast and reliable gear shifts on rough surfaces
• Adjustable stabilizer eliminates chain noise
• SHIMANO SHADOW RD+
• Clutch tension adjusted specifically for Gravel
• Stabilizer ON/OFF switch for terrain matching: ON for Gravel, OFF for smooth surfaces
• LED status indicator
• Battery indicator, matching, adjustment mode, etc.
• Smallest sprocket: Max. 11D/Min. 11D
• Largest sprocket: Max. 36D/Min. 34D
• Total capacity: 40D

Tech spec

• Series: GRX
• Sprockets: 12
• RD Structure: SHIMANO SHADOW RD+ ✔
• Mounting: Direct mount (conventional) ✔
• Direct mount: ✔
• Front max differential: 17D
• Total capacity: 40D
• Min sprocket: 36-34 D
• Max sprocket: 11D
• Fluoro-coated bushings: 4
• Cable guide pulley: Sealed bearing
• Pulley bearing T: Sealed bearing
• Teeth: 11/13D
• Recessed pulley pin: ✔
• Retaining axle: Hollow axle ✔
• Retaining axle 2: Hollow axle ✔
• Wired Di2 connectivity: ✔
• Wireless Di2 connectivity:  ✔
• Adjustment mode information:✔
• DI2 battery level: ✔
• Selected ratio: ✔
• SHIMANO E-BIKE SYSTEMS data items: ✔
• Compatible with E-TUBE RIDE: ✔
• Compatible with E-TUBE PROJECT: ✔
• Adjustment mode information: ✔
• Battery charge level DI2: ✔
• Selected ratio: ✔
• SHIMANO E-BIKE SYSTEMS data items: ✔
• Firmware updated by E-TUBE PROJECT: ✔
• SD50 port: 0 pcs
• SD300 port: 1 pc
• SD50 connector: 0 pcs
• SD300 connector: 0 pcs
• LED for system status: ✔
• Charging cable: EW-EC300