Shimano GRX RD-RX815-R Di2 11-Speed for 34T Max Shadow+ Rear Derailleur

Designed for riding on rough roads, through gravel and mud, to be able to carry on in comfort, stress-free, to wherever you want, to allow you to achieve that unique sense of accomplishment. The first groupset designed for Gravel riding Explore beyond. Introducing SHIMANO GRX

. Adjustable chain stabilizer prevents chain slapping and drops
. Switch stabilizer ON/OFF to match the terrain
. Gravel-tuned clutch tension
. Silent and uninterrupted rear shifting on rough terrain
. Total capacity: 38T
. Smooth and reliable mixed surface shifting
. Compatible with current road Dual Control Lever
. Maximum front difference: 17T
. Top sprocket: Max. 11T/Min. 11T
. Low sprocket: Max. 34T/Min. 30T