Shimano GRX Di2 RD-RX815 Rear Derailleur

For rides on smooth surfaces, the derailleur features and ON/OFF switch for the chain tensioner. The RD-RX815 DI2 version offers the digital precision of SHIMANO electronic shifting and synchronized shifting. and is compatible with road cassettes with a 34T low sprocket max.

• GRX Di2 11 speed rear derailleur for double cranks
• Adjustable chain stabilizer prevents chain slapping and drops
• Gravel-tuned clutch tension can be toggled ON/OFF to match the terrain
• Maximum front difference: 17T
• Total capacity: 40T
• Low sprocket: Max. 34T/Min. 30T
• Top sprocket: 11T
• 287g