Shimano's GRX RX825 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.Integrated wireless unit charging port and switch allows a compact design Offers fast and reliable shifting on rough terrain Adjustable chain stabilizer prevents chain slap Shimano Shadow RD+ offers a quiter drivetrain by utilizes a stablizer to reduce chain slap and provides a simple solution for chain drops Gravel-tuned clutch tension features a switch stabilizer ON/OFF to match terrain - ON for gravel OFF for smooth roads LED status indicator to easier identify battery life pairing adjust mode etc. Top sprocket: Max. 11t/Min. 11t Low sprocket: Max. 36t/Min. 34t Total Capacity: 40t
| Largest Cog | 36 |
| Rear Der/Shifter Compatibility | Shimano Road Di2 |
| Rear Derailleur Mount Type | Shimano Rear Direct Mount |
| Drivetrain Speeds | 12 |
| Chain Wrap Capacity (teeth) | 40 |
| Cage Length | Long |
| Color | Black |
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