Shimano GRX Di2 RD-RX817 Rear Derailleur

For rides on smooth surfaces, the derailleur features and ON/OFF switch for the chain tensioner. The RD-RX817 DI2 version offers the digital precision of SHIMANO electronic shifting and synchronized shifting. and is compatible with mtb cassettes with a 42T low sprocket max.

• GRX Di2 11 speed rear derailleur for 1X cranks
• Adjustable chain stabilizer prevents chain slapping and drops
• Gravel-tuned clutch tension can be toggled ON/OFF to match the terrain
• Low sprocket: Max. 42T/Min. 40T
• Top sprocket: 11T
• 318g