Shimano GRX RD-RX817 11-Speed Di2 Rear Derailleur

With an integrated chain stabilizer mechanism the Shimano GRX derailleur provides a quieter experience with shifting security and precision on mixed terrain. For rides on smooth surfaces the derailleur features and ON/OFF switch for the chain stabilizer. The RD-RX817 Di2 version offers the digital precision of Shimano electronic shifting as well as synchronized shifting and is compatible with MTB cassettes with a max cog size of 42T.

• For 1x drivetrains
• Operates with Shimano Di2 for digital electronic shifting
• Gravel-tuned clutch tension provides smooth and reliable mixed surface shifting