GRX RD-RX400 Rear Derailleur
- A Shadow RD+ chain stabilizer prevents chain slapping and drops
- The gravel-tuned clutch tension helps to provide smooth and reliable mixed surface shifting
- Stabilizer can be turned on/off to match terrain
- Compatible only with 10-speed ST-RX400, ST-4700, ST4720, ST-4725, ST-RS405 and SL-4700 shift levers