Shimano GRX RX400 10-Speed Rear Derailleur

With an integrated chain stabilizer mechanism, the Shimano GRX derailleur provides a quieter experience and shifting security and precision on mixed terrain. For rides on smooth surfaces, the derailleur features and ON/OFF switch for the chain tensioner.

- Adjustable chain stabilizer prevents chain slapping and drops
- Switch stabilizer ON/OFF to match the terrain
- Gravel-tuned clutch tension
- Maximum front T difference: 16T
- Silent and uninterrupted rear shifting on rough terrain
- Low cog: Max. 36T/Min. 30T
- High cog: Max. 11T/Min. 11T
- Total capacity: 41T
- Smooth and reliable mixed-surface shifting
- Compatible with current 10s road DUAL CONTROL LEVER
- Compatible with wide-range front gearing