The GRX RD-RX400 10-speed rear derailleur keeps shifting silent and uninterrupted when riding on rough terrain. 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 with 10-speed road Dual Control Levers. Item Specifications: Rear Derailleur Mount Type: Rear Direct Mount,10x1 Standard, Drivetrain Speeds: 10, Cage Length: Long, Chain Wrap Capacity (teeth): 41teeth, Largest Cog: 36, Color: Black, Rear Der/Shifter Compatibility: Road,