SHIMANO GRX DI2 RD-RX815 REAR DERAILLEURELECTRONIC SHIFTING FOR 2X11One thing is for sure and that is both gravel riding and electronic drivetrains are rapidly growing in popularity. Shimano decided to combine these two categories to create the Shimano GRX Di2 RD-RX815 Rear Derailleur. It is a gravel-specific rear derailleur that shifts electronically. It has an adjustable chain stabilizer that prevents chain slapping and drops and gravel-tuned clutch tension. It has silent and uninterrupted rear shifting on rough terrain and smooth and reliable mixed surface shifting.FeaturesAdjustable chain stabilizer prevents chain slapping and dropsGravel-tuned clutch tension for better performance offroadCompatible with current road dual control lever shiftersSpecificationsLow Sprocket Max34TLow Sprocket Min30TTop Sprocket Max11TTop Sprocket Min11TTotal Capacity38T | Shimano GRX Di2 RD-RX815 Rear Derailleur 2x11 Speed