Shimano GRX guarantees a quieter ride and offers safety and shifting precision on mixed terrain. Excellent for racing on smooth surfaces, the derailleur is equipped with an ON / OFF switch for chain tensioner. The RD-RX817 DI2 version offers the digital precision of the Shimano electronic and synchronized gears and is compatible with MTB cassettes with a minimum sprocket of 42D.

- Silent and uninterrupted rear transmission on rough terrain
- The adjustable chain stabilizer prevents shocks and falls of the chain
- Shimano SHADOW RD +
- Uniform and reliable change for mixed surfaces
- ACTIVATION / DEACTIVATION of the stabilizer according to the terrain
- Clutch tension adjusted according to gravel
- Compatible with the road DUAL CONTROL LEVER application
- Upper pinion: max 11D / min. 11D
- Lower pinion: max 42D / min. 40D
- Total capacity: 31D
- Max chainring teeth: 11T
- Capacity totale: 31T
- Rear gear number: 11
- Min chainring teeth: 40T
- System type: DI2