Shimano GRX 815 Di2 11-Speed Rear Derailleur

Shimano GRX 815 Di2 11-Speed Rear Derailleur The Shimano GRX 815 Di2 11-Speed Rear Derailleur has been specifically engineered for rough tracks; gravel roads and surfaces that would ordinarily cause the chain to bounce and slap. An innovative adjustable stabiliser uses spring force and friction to maintain tension through the chain; which prevents it from dropping and reducing noise from the drivetrain. The upshot is smoother; more reliable shifting no matter the surface; so whether you are riding bumpy gravel or smooth tarmac the derailleur functions with predictable crispness. You can even incorporate this into your regular electronic road-riding setup because the derailleur is compatible with current road Dual Control Levers.