The new RX800 rear derailleurs shares many characteristics with the Ultegra R8000/R8050 derailleur, such as precise accurate shifting and Shadow derailleur positioning, but with the added chain stabilizing clutch.
Much like Shimano’s MTB derailleurs the On/Off switch can be found next to the upper pulley.
When activated the rear derailleur pivot takes a firm hold to reduce excessive movement, noise and general ‘chain chatter’.
Features - Ultegra RX RD-RX800 GS 2x11-speed Rear Derailleur
SHIMANO SHADOW RD+ construction
Easily adjustable chain stabilizer to prevent the chain from hitting the chain or jumping off
Low profile rear derailleur design
Adapted for race specific frame design
GS Version - for Cassettes up to 34 teeth
Use: Road, Adventure, Gravel, Cyclocross
Mount Type: Direct Mount
Max. teeth large sprocket: 34T
Min. teeth large sprocket: 28T