Shimano GRX Di2 FD-RX825 2×12-speed Front Derailleur

For your riding freedom: the Gravel GRX Di2 2×12-speed Front Derailleur FD-RX825 Braze On from Shimano

Gravel cycling is not meant to be overly complicated. The heart and soul of cycling’s drop bar, dirt road discipline is rooted in simplicity, inclusivity, and adventure. No ride is out of bounds. All are welcome to join. Gear should be functional and reliable but need not break the bank. That’s why whether you’re a grizzled gravel cycling veteran or brand new to the road (or trail) less traveled, you’ll appreciate the latest iteration of Shimano’s groundbreaking—and industry-first-gravel-specific GRX component group. Designed to help you get the most from your next unpaved adventure, RX825 delivers top-tier performance without an over-the-top price.

For riders seeking the best of both worlds, the new 2×12 RX825 UNDROPPABLE drivetrain is the choice. Utilizing a gravel-optimized 48/31 or 46/30 front chainring paired with an 11-34 or 11-36 cassette, this setup delivers an ultra-wide gear range so you can spin a comfortable cadence whether cruising the flats, smashing endless dirt road rollers, or tackling a massive backcountry climb.

This setup delivers precise shifting both front and rear and an integrated SHADOW PLUS chain stabilization for ultimate security over bumpy terrain. The gravel-specific 2×12 option maintains tighter rear cassette gear steps, ideal for subtle cadence changes during competitive racing and spirited weekend group rides.

The new wireless Di2 platform ensures fast and smooth shifting at the front derailleur. It also offers a choice between manual shifting and synchronised shift assist modes – SEMI-SYNCHRO or FULL-SYNCHRO – that feel like your own personal assistant! In SEMI-SYNCHRO mode, the rear derailleur automatically adjusts to avoid big jumps in gear ratio so you can maintain your cadence and rhythm. In FULL-SYNCHRO mode, the rear derailleur and front derailleur work together harmoniously so that you always have the right gear engaged and no longer have to worry about it. Seamless communication with the rear derailleur combined with programmed chain guide control minimises the risk of the chain jumping off.
It’s up to you how often you want to think about the gear ratio!In the E-TUBE app, you can select the fully and semi-synchronised shifting functions. Thanks to the digital precision of the electronic shifting and its coordinated communication between the front and rear derailleurs, the SHIMANO GRX front derailleur offers an excellent shifting experience.

Features – Shimano GRX Di2 FD-RX825-F | 2×12-speed Front Derailleur Braze On

• Powerful, accurate, smooth front shifting
• Programmed chain guide control by automatic trim
• SHIMANO SYNCHRONIZED SHIFT
• Manual, full- and semi-synchronized shifting program
• Chainline +2.5mm vs. conventional road FD
• Compatible with up to 42mm tires
• Wider tire clearance
• Wider range front gearing 17T

Product features

• Use: Gravel, Cyclocross
• Group: GRX Di2 RX825
• Model: FD-RX825-F
• Mounting: Brazed-on
• Cable route type: Down-Pull
• Gear front: 2-speed
• Gear rear: 12-speed
• Top gear teeth: 48T
• Total capacity: 17T
• Compatible chain: 12-speed HG
• Chain stay angle: 63-66°
• Chain line: 47mm
• Compatible electric wire: EW-SD300
• Firmware update by E-tube Project: Yes
• E-tube port (pcs): 1
• E-tube connector (pcs): 0
• Di2 Wireless-Chip: No

Material

• Aluminum
• Steel
• GFRP

Color

• Series color

Weight

• approx. 142g (manufacturer information)

Scope of delivery

• 1 x Shimano GRX Di2 2×12-speed FD-RX825 Front Derailleur Braze On

Technologies

SEIS SHIMANO ELECTRONIC INTELLIGENT SYSTEM
The SEIS innovative shift technology is still based on the SHIMANO INDEX SYSTEM (SIS) that has proved its superior gear changing characteristics over the years. The big difference is that in this case, the shifting action is provided for by electronics instead of mechanics. This electronic shifting system has been extensively tested over past two years by several professional riders in all conditions possible, such as rain, mud, low temperatures, cobble stone roads and combinations of all of these at the same time. Shifting is executed by simply pressing the button. No power is needed to shift, which gives important advantages since it is easier now to always keep a tight grip on the handlebar and to keep your concentration on riding instead on shifting. The shift system allows accurate and effortless shifting in difficult circumstances like when you have cold hands or when you are completely exhausted. Furthermore, the shifting performance will never be affected by contaminated or stretched cables since the shifting signal is transferred electronically. The operating buttons work similarly to mechanical Dual Control Levers so you don’t need to re-program your mind for a new system.

E-Tube
E-Tube platform offers optimum flexibility on your bike. E-TUBE transmits interactive signals and power supply to each parts by “Plug & play” connection. E-TUBE is no rust, no stretch, no freeze and it ensures advanced low maintenance. And SM-PCE1 connects between PC and components to update firmware. Digital device stay the latest version with updating firmware for improve function.

Shimano GRX Di2