With road cycling moving more and more to gravel and multi-surface riding, Shimano has adopted some of its mountain bike tech to the road with the introduction of the new Ultegra RX rear derailleur with chain stabilizing technology.
The new RX800/805 rear derailleurs (mechanical and Di2) feature Shimano Shadow RD Plus technology and precise shifting with an added chain stabilizing switch to control the drivetrain over rough or uneven ground. Similar to Shimano’s mountain bike derailleurs, the On/Off switch for the clutch can be found next to the upper pulley. When activated the rear derailleur pivot is held firm 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. Pricing is $110 for the mechanical RD-RX800-GS and $285 for the Di2 compatible RD-RX805-GS.