Shimano Ultegra Di2 RX805 electric rear derailleur for road bikes

This rear derailleur takes things to the next level when the terrain gets brutal. Shadow DR+ technology locks the cage joint to ensure smooth shifting at all times, whatever the terrain. On routes like Paris-Roubaix, from gravel trails to cyclo-cross circuits, nothing can stand in its way.

For optimal performance, Shimano recommends using a cassette with a final sprocket between 28 and 34 teeth to ensure it functions perfectly.

Technical specifications

- Shimano RX805 DI2
- Shadow RD+ technology
- Cassette with a minimum of 28 teeth on the largest sprocket
- Maximum of 34 teeth
- Maximum front sprocket range: 16 teeth
- Small sprocket: minimum 11 teeth and maximum 12 teeth
- Manufacturer’s weight: 280 grams
- Shimano brand