Shimano Expands Ultegra R8000 Versatility with New Rear Derailleurs Featuring Chain Stabilizing Technology

With the diversification of road cycling and the growth of gravel and multi-surface riding, Shimano introduces Ultegra RX, rear derailleurs with chain stabilizing technology that furthers the versatility of the Ultegra R8000 drivetrain.  The new RD-RX800/RX-805 rear derailleurs, for mechanical and Di2 systems respectively, utilize Shimano’s proven SHIMANO SHADOW RD Plus derailleur technology that has been adapted and tuned for road drivetrains and riding conditions. 


Riders continue pushing road bike capabilities, evolving the sport from racing to encompass greater elements of adventure and including a broader range of riding styles. In a natural evolution, RX800 expands the potential of Ultegra R8000, combining chain stabilizing features with the same performance characteristics of Shimano’s most versatile performance road drivetrain.


The new RX800/805 rear derailleurs feature Shimano Shadow RD Plus technology and precise accurate shifting, but with the added chain stabilizing switch to control the drivetrain over rough or uneven ground. Much like Shimano’s mountain bike 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’.


The RX800/805 rear derailleurs are compatible with road dual control levers (mechanical or Di2) and will accommodate an 11-28T cassette up to Shimano’s wide-range 11-34T cassette.

RD-RX805-GS and RD-RX800-GS

-       Chain Stabilizer mechanism adopted from mountain         bike design

-       ON/OFF switch

-       Compatible with current road DUAL CONTROL LEVER

-       Shimano Shadow RD Plus technology

-       Max. front difference: 16T

-       MSRP - $109.99 (RD-RX800-GS),

        $284.99 (RD-RX805- GS)