SHIMANO GRX Di2 front derailleur FD-RX825 | 2x12-speed
With the GRX, Shimano launched the first gravel-specific groupset on the market. Since then, the range of applications and the range of gravel bikes has expanded significantly. Shimano has responded to this development by updating the GRX groupset. It now comes with modern Di2 technology and a 12-speed drivetrain. The high level of functionality and quality reflects the Japanese company's many years of experience.
Technically, the GRX Di2 is similar to the current road bike groupsets. The shifting commands are transmitted wirelessly to the front derailleur and rear derailleur. The latter are connected to a central battery, which can be concealed in the seat post, for example. The 12-speed drivetrain has also been adopted and enables a wider gear range. This makes long uphill rides very comfortable even for less trained riders.
The advantage of electronic shifting systems is particularly noticeable in the front derailleur. At the touch of a button, the chain moves from one chainring to the other as if by magic, without any effort at all. It also thinks for itself and automatically adjusts its position to the chain skew to avoid grinding noises. With the help of the Shimano E-Tube app, the front derailleur is adjusted after installation and a manual, fully or semi-synchronous shifting mode is selected depending on preference.
The GRX front derailleur has been designed to suit the wider tires of gravel bikes. Compared to Shimano Road front derailleurs, the chainline has been moved outwards by 2.5 mm to 46 mm. Designed for Shimano 12-speed chains and with its chainring capacity of 17 teeth, the front derailleur harmonizes perfectly with the GRX FC820-2 crank with 48-31 teeth.
Technical data:
Material: aluminum, stainless steel, glass fibre reinforced plastic
Design / actuation: 2-speed, downswing
Mounting: Braze-on base
Compatibility shifting system: Shimano Di2 ST-RX825 shift / brake lever
max. largest chainring: 48 teeth
max. difference at the front: 17 teeth (difference between smallest and largest chainring)
optimum chainline: 47 mm
Color: black-anthracite
Weight according to manufacturer: n.a.
Weight self-weighed: 138g
Scope of delivery: 1x SHIMANO GRX Di2 front derailleur FD-RX825 | 2x12-speed