Shimano XT FD-M8020 / FD-M8025 2-/11-speed Front Derailleur

Item number: 43942
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Shimano XT FD-M8020 / FD-M8025 2-/11-speed Front Derailleur - black/E-Type / side-swing / front-pull
Shimano XT FD-M8020 / FD-M8025 2-/11-speed Front Derailleur - black/E-Type / side-swing / front-pull
Shimano XT FD-M8020 / FD-M8025 2-/11-speed Front Derailleur - black/E-Type / side-swing / front-pull
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  • Online since 1998
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The Shimano XT front derailleurs FD-M8025 and FD-M8020 - from classic to innovative

The Shimano XT front derailleurs FD-M8020 and FD-M8025 shift two chainrings in the 11-speed Mountain bike drivetrain and contribute significantly to the DynaSys11 performance. The FD-M8025 is a model with classic cable routing (dual-pull or down-pull) and conventional construction (down-swing or top-swing), while the FD-M8020 features innovative side-swing technology and the associated front-pull routing. These provide a higher shifting force and even more tyre clearance. Mounting options include clamp mounts, direct mount and E-type for both models.


Series: Deore XT M8000
Application: Cross Country, All Mountain
Gearing: 2x (combined with 11-speed)
Chainstay Angle: 66-69°
Chainline: 48.8 mm
Chainring Size (max.): 34-38 teeth
Capacity: 10 teeth
Cable Routing: front-pull, top-pull, down-pull, dual-pull
Movement: side-swing, down-swing, top-swing
Mount: high clamp, low clamp, E-type* (bottom bracket mount, low-direct), direct mount (high-direct)
Clamp Diameter: 34.9 mm with adapter 31.8 mm/28.6 mm
Compatibility: HG-X11 chains

* FD-M8020: Frames must be made for E-type mounts, retrofitting an E-type retaining plate is not possible.

Technical Information:

Outer Body Material: aluminium, steel (only FD-M8025-E, FD-M8025-L)
Inner Body Material: aluminium
Cage Material: steel


- increased stability, manoeuvrability and shifting efficiency
- more tyre clearance for large wheels
- compatible with shorter chainstays
- efficient cable routing for easy gear changes
- versatile specifications, compatible with traditional mounting options
- 50 % higher shifting force (outward, compared to previous XT, only FD-M8020)
- increased traction range for long travel and active rear suspension (FD-M8020 only)
- 2, 6 or 8 joint bushings depending on version
- painted parallelogram, plated cage plates
- E-type and direct mount versions compatible with B cranks with 3 mm outer chainline


The real advantage of the 11-speed drivetrain is that the entire range of ratios is available without having to give up the usual rhythm. Dyna-Sys11 ensures an optimal rhythm both in the flats and in the ascents with " Rhythm Step" gears in the most frequently used range. Drive efficiency is a critical performance indicator for the drivetrain. Dyna-Sys11 means more speed with the same effort.

Side-Swing (FD-M8020 only)
The so-called Side-Swing technology delivers 90% better shifting performance. Developed with particular regard to modern bikes, the Side-Swing derailleur offers 15 % more space between seat tube and tyre, while the completely new and optimised cable pull and cable routing drastically reduces the force needed to operate the shifter.

Manufacturer Part Numbers:

high clamp / down-swing / top-pull: I-FDM8025HTX6
high clamp / down-swing / dual-pull: I-FDM8025HX6
low clamp / top-swing / down-pull: I-FDM8025LX6
high clamp / side-swing / front-pull: I-FDM8020HX6
low clamp / side-swing / front-pull: I-FDM8020LX6
direct mount / down-swing / top-pull: I-FDM8025DT6
direct mount / down-swing / dual-pull: I-FDM8025D6
direct mount / side-swing / front-pull: I-FDM8020D6
E-type / top-swing / down-pull: I-FDM8025ED6X
E-type / side-swing / front-pull: I-FDM8020E6X


- 1 x Shimano XT FD-M8020/FD-M8025 front derailleur
- 1 x 28.6 mm adapter (only clamp model)
- 1 x 31.8 mm adapter (only clamp model)


  • black/low clamp / top-swing / down-pull: 131 g
  • black/low clamp / side-swing / front-pull: 129 g
  • black/high clamp / down-swing / top-pull: 149 g
  • black/high clamp / down-swing / dual-pull: 149 g
  • black/high clamp / side-swing / front-pull: 145 g
  • black/direct mount / down-swing / dual-pull: 139 g
  • black/direct mount / down-swing / top-pull: 139 g
  • black/direct mount / side-swing / front-pull: 134 g
  • black/E-Type / top-swing / down-pull: 124 g
  • black/E-Type / side-swing / front-pull: 120 g


in stock 2 to 7 days up to 10 days Out of stock inform me
  • black/low clamp / top-swing / down-pull
  • black/low clamp / side-swing / front-pull
  • black/high clamp / down-swing / top-pull
  • black/high clamp / down-swing / dual-pull
  • black/high clamp / side-swing / front-pull
  • black/direct mount / down-swing / dual-pull
  • black/direct mount / down-swing / top-pull
  • black/direct mount / side-swing / front-pull
  • black/E-Type / top-swing / down-pull
  • black/E-Type / side-swing / front-pull

Customer Reviews (5)


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Customer Reviews (5)


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by Lorenzo Z.  on 13.11.2020

In combination with the XT chainrings of the same series, the shifts are as good ans as fast as with the rear derailleur --which is not necessarily surprising, since MTB chainrings are now significantly smaller than what you find in a cassette...

But what I really want to write here is: maybe I am discovering hot water, but this derailleur (and therefore all its sister products above and below) work flawlessly with the last generation of Shimano STIs (2x front), without adapters or any hackery. It's plug and play. So no needof Di2 or AXS or other very expensive componentry to run a MTB crankset and front derailleur with STIs, if you want to do a gravel build with a frame that does not accept road cranks. Or you simply want the small chainrings.

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