The Shimano GRX Di2 12-speed rear derailleur features an integrated wireless connection unit and a charging port, ensuring quick and reliable gear shifts on mixed terrain as well as easy recharging. The integrated Shadow RD+ technology prevents chain slap and guarantees precise gear changes, even on rough terrain. Thanks to the built-in on/off switch, removing the wheels is also straightforward. The RD-RX825 is compatible with 12-speed cassettes 11-34D and 11-36D and accepts synchronized or semi-synchronized shifting modes to enhance customization options for the rider.

• Compact design with integrated wireless unit, charging port, and switch
• Fast and reliable gear shifts on uneven terrain
• Adjustable chain tensioner prevents chain slap
• Shimano Shadow RD+ derailleur
• Derailleur tension tuned for gravel riding
• Stabilizer can be activated or deactivated depending on terrain: ON for gravel, OFF for smooth roads
• LED status indicator
• Battery indicator, pairing, setup mode, etc.
• Small sprocket: Max. 11D/Min. 11D
• Large sprocket: Max. 36D/Min. 34D
• Total capacity: 40 teeth
• Type: Direct mount (Shadow +)
• Packaging: Individual packaging
• Affected countries: Group 1.