SHIMANO GRX 12-Speed Rear Derailleur RD-RX825

The SHIMANO GRX Di2 12-speed rear derailleur features an integrated wireless unit and charging port for quick and stable shifting on mixed terrain and easy charging. Integrated SHADOW RD+ technology prevents chain slap, ensuring precise shifting even on rough terrain. Additionally, the integrated ON/OFF switch makes wheel removal a breeze. The RX825 rear derailleur is compatible with 11-34T and 11-36T 12-speed cassettes and supports full or semi-synchronized shifting modes, giving riders more room to adjust according to their needs.