Shimano Di2 RD-RX805-GS rear derailleur

The gravel rear derailleur from the Ultegra Di2 series featuring the proven Shadow Plus friction damper

The Ultegra RDR X805 Di2 rear derailleur with its medium-length cage allows the use of cassettes with up to 34 teeth. Shadow Plus technology very effectively reduces chain slap off-road. Precise, lightning-fast shifting at the touch of a button, in any situation. The Shimano Ultegra RD RX800 rear derailleur is even more compact and lighter than its predecessor and features E-Tube connectors for incredibly easy installation. Equipped with a crash mechanism that disconnects the link to the motor in the event of strong external forces to prevent damage.

Synchro-Shift technology

Synchro-Shift technology simplifies shifting immensely and significantly reduces the number of decision-making processes that take place whilst riding. Particularly in crucial race situations or when riding at the limit, riders often have to navigate a multitude of decision-making processes alongside the physical strain, which are frequently disrupted and lead to poor decisions. The fewer decisions there are to make, the better the decisions will be and the more attention can be focused on the race. This is precisely what Shimano Synchro-Shift technology enables, always selecting the optimal next-higher or next-lower gear combination, regardless of whether this requires shifting at the rear derailleur and/or the front derailleur.

Shimano Synchro-Shift functions

• Full Synchro-Shift: The front derailleur reacts to the gear changes the rider makes on the rear derailleur. Essentially, this means that only one shifter with two buttons is needed to operate both the rear and front derailleurs.
• Semi Synchro-Shift: The rear derailleur responds to the gear changes the rider makes on the front derailleur. The rear derailleur automatically performs the necessary compensatory shifts for small changes in cadence when shifting up or down on the front derailleur.

Shimano Shadow Plus RD

With its sophisticated technology, the Shimano Shadow rear derailleur is particularly well-suited to a more aggressive riding style. Its extremely slim profile brings a number of improvements. Thanks to its flat design and construction based on single preload, the rear derailleur does not strike the chainstay even under the harshest conditions. The shifting is smooth and quiet.

Shimano Di2 installation:

Installing Shimano Di2 components is almost easier than fitting traditional gear systems. The standardised cable connectors and junction box ensure straightforward and quick installation. The shift levers are connected to Junction Port A on the junction box; a cable runs from Junction Port A to Junction Port B on the junction box, and from there the cables run to the rear derailleur, front derailleur and battery. The battery can be mounted externally on the bottle cage or internally in the seat tube or down tube. Frames specifically designed for this purpose are required for internal cable routing.

To use the wireless function, the new BT-DN110 battery and the EW-WU111 Bluetooth module are also required.

Shimano Ultegra DI2 RD RX805 Rear Derailleur Technical Specifications:

• Wide Link Design: the wider outer parallelogram increases stiffness
• Shadow Plus
• Cold-forged aluminium
• 11-speed compatible
• Largest sprocket to be shifted, rear 34 teeth
• Total capacity: 39 teeth
• Compatible only with Shimano Dura-Ace and Ultegra Di2 11x2-speed shifters
• Weight 280 grams (manufacturer’s specification)

Herstellerinformation: SHIMANO INC., 3-77 Oimatsu-cho, Sakai-ku, Sakai-shi, Osaka 590-8577, Japan, www.shimano.com | EU contact: Shimano Europe BV, High Tech Campus 92, 5656 AG Eindhoven, The Netherlands, www.shimano.com