Shimano GRX Di2 RX817 electric rear derailleur for road bikes with single chainring

With an integrated chain stabilisation mechanism, the Shimano GRX rear derailleur offers a quieter experience, as well as safer, more precise gear changes on mixed terrain. For rides on smooth surfaces (roads), however, it is possible to deactivate the Shadow system, as the derailleur features an ON/OFF switch for the chain tensioner.

The RD-RX817 DI2 rear derailleur offers digital shifting precision and also benefits from the Shimano Synchro-Shift system (synchronised gear changes).

This derailleur is compatible with road cassettes with a large sprocket of up to 42 teeth.

The Shimano GRX groupset stands out with its Gravel-specific components: Gravel ergonomics, optimised gearshift options, reliability and a silent, stable transmission.

Shimano insists that this is not a reworked version of its road components, but indeed a groupset specially adapted to the constraints of Gravel riding.

Features :

- Quiet, uninterrupted rear gear change on rough terrain
- Compatible with current DUAL CONTROL road levers
- For single drivetrain
- Small sprocket: Max. 11dts/Min. 11dts min.
- Large sprocket: Max. 42dts/Min. 40dts
- Total capacity: 31 dts
- Reference Shimano: IRDRX817
- Shimano part number: RD-RX817
- Transmission type: Di2 electric
- Shadow RD+ system
- Weight: 318 grams