12-speed Di2 New User Guide
Just bought a new 12-speed Di2 bike? This page explains what the buttons do, how to charge, and what synchronized shfit does.
Front Derailleur
GRX FD-RX825
Shimano's twelve-speed GRX RX825 Di2 gravel front derailleur was designed to be used with a 47mm chain line (+2.5mm compared to 12-speed road) . It is meant to be paired with the GRX rear derailleur, RD-RX825, but it'll work with other 12-speed road derailleurs and shifters too.
The derailleur's total capacity is 17T and supports 46-48T top gear teeth.
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Just like the 12-speed 105 front derailleur, this FD-RX825 has one top limit screw and one electronic limit.
If you want to build a 1x GRX bike, you can omit the front derailleur. You don't have to install it in order for the bike to work.
Specifications
- Model code: FD-RX825
- Series: GRX (RX825)
- Weight: 142g
- Speeds: 12
- SD300 ports: 1
- Total capacity: 17T
- Chain line: 47mm
- Top gear teeth: 46-48T
Related components
View all componentsRelated pages
12-speed Front Derailleur installation and adjustment guide
Twelve-speed Di2 Front Derailleurs do not have any limit bolts, so installing the derailleur and setting the limits is different from what you're used to. Don't worry, though, it's easy! I'll show you how to install the 12-speed Di2 front derailleur, and set its limits and micro-adjustment.
Set up 12-speed 105 Di2 and GRX Di2 Front Derailleur limits
Read how to set up your GRX / 105 12-speed Di2 Front Derailleur - FD-RX825 / FD-R7150.
Manuals & other documents
Firmware updates
Below is an overview of all known firmware updates for this component. The changelog texts are Shimano's, and quite often they're a bit cryptic - sorry!
4.2.0
Firmware released.
More images