Shimano GRX Di2 FD-RX815 front derailleur
The new Shimano GRX Di2 FD RX 815 series, the electronic version of Shimano’s cyclocross and gravel components. Perfect shifting and programmable.
The Shimano GRX Di2 FD-RX815 front derailleur has been designed to effortlessly handle the 17-tooth chainring difference of the FC-RX810-2 crankset. Naturally, the front derailleur also accommodates the 2.5 mm wider chainline of the GRX cranks, which ultimately allows for the use of wider tyres. Furthermore, thanks to its integrated control functions, the FD-RX815 offers simple and intuitive adjustment options. Accordingly, the Di2 front derailleur allows you to programme the chain guide adjustment and supports Shimano’s Synchro-Shift function in semi or full mode.
Synchro-Shift technology
Synchro-Shift technology greatly simplifies gear changes and significantly reduces the number of decisions riders have to make whilst riding. Particularly in critical race situations or when riding at the limit, riders often have to juggle a multitude of decisions alongside the physical strain, which can lead to errors. 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 Di2 installation:
Installing Shimano Di2 components is almost easier than fitting traditional gear systems. The standardised cable connectors and the 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 FD RX815 front derailleur Technical specifications:
- Compatible with SG-X chainrings
- for 2-speed cranksets
- Capacity: 16 teeth
- Largest chainring to be shifted: 46–53 teeth
- For 43.5 mm chainline
- For chainstay angles of 61–66 degrees
- Weight: 125 g Solder-on mount version
- Compatible only with Shimano Dura-Ace, GRX Di2 and Ultegra Di2 11x2-speed shifters
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
