Shimano Ultegra DI2 Shadow RD-R8150 12-SPEED Rear Derailleur


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  • The RD-R8150 12-speed rear derailleur is the central element of the Shimano Ultegra Di2 road bike groupset when it comes to semi-wireless as well as fully-wired shifting. It has even more to offer than a conventional rear derailleur, since it communicates wirelessly with the shift/brake levers via the built-in wireless chip in the disc brake version. In the rim brake version with a cable connection to the STIs, it is responsible for coupling the components. This is done via a function button, which is also used to adjust the rear derailleur. You can also use the button to check the battery level, change the shift mode from manual to Synchro and Semi-Synchro Shift, and establish a Bluetooth connection to a bike computer or smartphone. An LED display helps you to do this. The rear derailleur is connected to the battery via a cable, from which a cable also runs to the front derailleur and possibly to the STIs. It has a charging port that allows you to easily recharge your circuit using the matching charging cable. In racing and training use, RD-R8150 convinces with an extremely high shifting speed that clearly surpasses that of its predecessor. Its flat Shadow design reduces the risk of snagging and optimises shifting. With a total capacity of 39 teeth, you can shift 12-speed cassettes with a largest sprocket of 28 to 34 teeth. The rear derailleur consists largely of lightweight aluminium, resulting in a weight of just over 260 grams.


    Series: Ultegra Di2 R8150
    Application: Road
    Gearing: 12-speed
    Mount: Standard (Direct Mount compatible)
    Capacity: 39-tooth
    Compatibility: Shimano Road 12-speed
    Compatibility - Chains: HG 12-speed


    Derailleur Pulleys: 11-tooth
    Outer Cage Material: Aluminium
    Inner Cage Material: Aluminium
    Other Materials: Aluminium, steel, stainless steel, composite material (GFRP)


    Power Cable: EW-SD300-I (1 x connection)
    Shift/Brake Lever: ST-R8150, ST-R8170, ST-R7170, ST-R8060, ST-R9250, ST-R9270, ST-R9160, ST-R9180
    Cassette: CS-R8100-12, CS-R8101-12, CS-R9200-12, CS-R7100-12, CS-R7101-12
    Chain: CN-M8100, CN-M9100, CN-M7100, CN-M6100
    Charging Cable: EW-EC300

    - Function button, charging port and wireless system in one compact unit
    - Di2 wireless chip with low interference probability, high processing speed and low power consumption
    - LED status display (battery, pairing, settings mode, Synchro Shift)
    - Takes over the function of previous wireless units in establishing a wireless connection with compatible cycling computers
    - Extremely high shifting speed: 58% faster than RD-R9150
    - Flat design
    - Connected to battery via cable
    - Only one cage length for all gradations
    - Firmware updates via E-Tube Project
    - 4 fluorine-coated joint bushes
    - Tension and guide roller bearing


    Max. Largest Sprocket Teeth: 34-tooth
    Min. Largest Sprocket Teeth: 28-tooth
    Max. Smallest Sprocket Teeth: 11-tooth
    Min. Smallest Sprocket Teeth: 11-tooth
    Max. Chainring Difference: 16-tooth
    Total Capacity: 39-tooth
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