Shimano Ultegra FD-R8150 DI2 Front Derailleur


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  • The FD-R8150 electronic front derailleur for the Ultegra 2x12-speed road bike groupset from Shimano has a more compact design than its predecessor and is therefore even more aerodynamic. With a total capacity of 16 teeth, this allows large chainrings with a maximum of 50 to 52 teeth to be shifted, whereby the shifting speed has been increased enormously compared to the past. The front derailleur is compatible with a chainline of 44.5 mm and is designed for braze-on mounting. With the help of a suitable adapter, however, it is also possible to mount a clamp on the frame. It is connected to the battery via a cable, which in turn is also connected to the rear derailleur and, if applicable, the STIs. Of course, FD-R8150 has the proven Synchro and Semi-Synchro Shift function, which enables an automated interaction with the rear derailleur and thus makes shifting easier. The inner parallelogram and the deflectors of the front derailleur are made of steel, the outer parallelogram is made of aluminium to save weight.


    Series: Ultegra Di2 R8150
    Application: Road
    Gearing: 2x (combined w/ 12-speed)
    Chainstay Angle: 61 - 66degree
    Chainline: 44.5 mm
    Chainring Size (max.): 50 - 52 teeth
    Capacity: 16-tooth
    Movement: Down-swing
    Mount: Braze-on
    Compatibility: HG 12-speed chains


    Outer Body Material: Aluminium
    Inner Body Material: Steel
    Cage Material: Steel
    Number of E-Tube Ports: 1


    Power Cable: EW-SD300-I (1 x connection)
    Shift/Brake Lever: ST-R8150, ST-R8170, ST-R8060, ST-R9250, ST-R9270, ST-R9160, ST-R9180, ST-R7170
    Crank: FC-R8100, FC-R8100-P, FC-R9200, FC-R9200-P, FC-R7100, FC-RS520
    Chain: CN-M8100, CN-M9100, CN-M7100, CN-M6100
    Clamp Adapter: SM-AD91


    - High shifting speed: 45 % faster than FD-R9150
    - Slimmer, flatter and lighter than predecessor
    - Front area reduced by 33 %, thereby less wind resistance
    - Connected to battery via cable
    - Fully- and semi-synchronous shift mode adjustable (via E-Tube or rear derailleur)
    - Firmware updates via E-Tube Project
    - 4 joint bushings
    - Painted parallelogram
    - Plated cage plates
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