Shimano Gravel GRX RX817 Di2 11-Speed Rear Derailleur

RD-RX817 - SHIMANO GRX - DI2 - Rear Derailleur - SHIMANO SHADOW RD+ - 42T max low sprocket - 11-speed

With an integrated chain stabiliser 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 an On/Off switch for the chain tensioner. The RD-RX817 DI2 version offers the digital precision of Shimano electronic shifting and synchronised shifting. It's compatible with MTB cassettes with a 42T low sprocket max.

• Adjustable chain stabiliser prevents chain slapping and drops
• Switch stabiliser On/Off to match the terrain
• Gravel-tuned clutch tension
• Silent and uninterrupted rear shifting on rough terrain
• Smooth and reliable mixed surface shifting
• Compatible with current road Dual Control Lever
• Top sprocket: Max. 11T/Min. 11T
• Low sprocket: Max. 42T/Min. 40T
• Total capacity: 31T