Shimano GRX Di2 FD-RX825 front derailleur

Lighter, faster and with greater tyre clearance: the GRX 12-speed Di2 front derailleur. Designed for the GRX 12x2-speed crankset with 48-31 chainring sizes, the new 12-speed Di2 front derailleur operates even faster and more precisely.

Shimano GRX RD-RX825 Di2 12-speed rear derailleur Technical specifications:

• For 2x12-speed cranksets
• Solder-on mount
• Capacity: 17 teeth
• Smallest/largest chainring to be shifted: 31/48 teeth
• For 47 mm chainline
• For chainstay angles of 63–66 degrees
• Compatible with Shimano Di2 12x2-speed shifters
• Cable connection: EW-300
• Weight: 110 grams (manufacturer’s specification)

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 crucial race situations or when riding at the limit, riders often have to make a multitude of decisions alongside the physical strain, which are frequently disrupted and lead to wrong 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 12-speed Di2 installation:

Shift commands are transmitted wirelessly from the shift levers to the rear derailleur. Only the rear derailleur and front derailleur are connected to the battery via cables. This ensures a clean look and significantly reduces the installation effort. The shift levers are powered by CR1632 batteries. The shift levers feature an additional cable connection, which allows for the connection of auxiliary switches. Traditional cabling from the shift levers to the battery is also possible. The new battery has three slots.

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