The Shimano GRX RD-RX400 10-speed rear derailleur keeps shifting silent and uninterrupted when riding on rough terrain.

Specifications:

• Rear Derailleur Mount Type: Shimano Rear Direct Mount
• Rear Derailleur Mount Type: 10x1 Standard
• Rear Der/Shifter Compatibility: Shimano Road
• Cage Length: Long
• Drivetrain Speeds: 10
• Weight: 303
• Color: Black
• Chain Wrap Capacity (teeth): 41
• Largest Cog: 36