Shimano GRX RD-RX817 Di2 Rear Derailleur, 11-Speed, Shadow Plus, DM 11-40/42t

Shimano GRX RD-RX817 Di2 Rear Derailleur – 11-Speed – Long Cage – Black

The GRX RD-RX817 is Shimano’s gravel-specific Di2 rear derailleur designed for 1x drivetrains. It delivers precise electronic shifting with gravel-tuned clutch tension for improved chain stability on rough and mixed surfaces.

Built for riders who want reliable, low-maintenance electronic performance in demanding gravel and adventure conditions.

Performance & Use

• Shimano Di2 electronic shifting for fast, accurate gear changes

• Gravel-tuned clutch system for improved chain retention

• Optimized for 1x gravel drivetrains

• Smooth and reliable performance over mixed terrain

Compatibility Notes

• Compatible with Shimano 11-speed Road Di2 systems

• Designed for 1x drivetrains

• Shimano Rear Direct Mount standard

• Maximum cassette cog: 42T

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Specifications

• Brand: Shimano

• Model: GRX RD-RX817

• Drivetrain Speeds: 11-Speed

• Cage Length: Long

• Largest Cog: 42T

• Chain Wrap Capacity: 31T

• Rear Derailleur Mount Type: Shimano Rear Direct Mount

• Rear Der/Shifter Compatibility: Shimano Road Di2

• Color: Black

• Weight: 318g

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Condition & Packaging

• Retail packaged

• Full manufacturer warranty

• Genuine Shimano product

• Authentic, direct from manufacturer

• Includes only what is shown in photos

Professional installation recommended for proper setup and warranty support.