Shimano GRX 817 Di2 11-Speed Rear Derailleur RDRX817

Shimano GRX 817 Di2 11-Speed Rear Derailleur The Shimano GRX 817 Di2 11-Speed Rear Derailleur uses a gravel-tuned clutch and adjustable chain stabiliser to deliver a smoother, more reliable experience to your gravel and adventure riding. You can switch the stabiliser on or off depending on the terrain, and the spring force, combined with the friction, keeps the chain tension high so that chain slap and noise are reduced - perfect for broken roads. With the Shimano E-TUBE platform that supports the electronic gears you can wirelessly customise the settings and shifting synchronisation from a smartphone, even from the roadside, and the resilient all-weather design of the system will keep you riding in all weathers. It is compatible with current road Dual Control Levers, making it a great upgrade if your local roads are in poor condition.