Shimano ultegra di2 rear derailleur 6870 11 Speed replaced by GRX RX815 Di2 1_2x11 speed

The Shimano ultergra 11-speed Rear road Derailleur can be easily replaced by a GRX Di2 RD-RX815 2x11-speed Rear Derailleur
Based on the technology introduced by SHIMANO with the RX rear derailleurs, the GRX Di2 RD-RX815 2x11-speed rear derailleur is characterised by quiet, smooth, precise and reliable shifting, even in the most demanding terrain, thanks mainly to the SHADOW RD+ chain stabilisation system.
For gravel, road and cyclocross use: Shimano Di2 GRX 2x11-speed Rear Derailleur RD-RX815
It prevents the chain from hitting and unnecessary movements of the rear derailleur cage, thus ensuring uninterrupted switching performance. In total, the GRX family offers five rear derailleurs, which are used depending on the selection of the cassette and the shift system. The rear derailleurs with short cage (Di2: RD-RX815; mechanical: RD-RX810) are used for 11-30T or 11-34T cassettes at ULTEGRA, 105 or TIAGRA level. If you use the 11-40T or 11-42T DEORE XT, SLX or DEORE groups, you will need the long cage rear derailleurs (Di2: RD-RX817; mechanical: RD-RX812), both of which have a specific lever-operated ratio for the road bike. Finally, in a 10-speed setup, SHIMANO's HG500-10 cassettes (11-32T, 11-34T, 11-36T) with the RD-RX400 rear derailleur are used.

SHIMANO's GRX, the first Gravel-specific component family designed for both fast progress and safe bike handling on loose surfaces, is the result of an intensive and extensive research, testing and development process that incorporates information and feedback from countless riders on trails, forest tracks, gravel tracks and asphalt all over the world.
Features - GRX Di2 RD-RX815 2x11-speed Rear Derailleur SHADOW RD+

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
Smooth and reliable mixed surface shifting
Compatible with current road DUAL CONTROL LEVER

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