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Shimano Ultegra Di2 RD-R8150 Rear Derailleur - 12-speed - black

Shimano Ultegra Di2 RD-R8150 Rear Derailleur - 12-speed - black


Ultegra R8100 – Leave Time Behind

When developing the Ultegra R8100 series, Shimano took a holistic and 100 % performance-oriented approach, because great speed means great responsibility. Faster than ever before, the 12-speed road groupset scores with unparalleled control and comfort anytime and anywhere – whether in an everyman race, on the hunt for a personal best time or on a companionable ride.

As with the Dura Ace R9200, not only does Hyperglide+ make its way into the Ultegra's components, also its Di2 parts rely on Wireless technology to simplify operation and ensure smooth shifting.


Shimano Ultegra Di2 RD-R8150 rear derailleur

The Di2 actuators in the front and rear derailleurs of the current Ultegra series enable a significantly higher movement speed for a shorter movement time when changing gears and correspondingly rapid shifting processes.

The Shimano Ultegra Di2 RD-R8150 rear derailleur speeds up the shifting process by 58 % compared to the previous generation Dura Ace model RD-R9150. The rear derailleur with an uniform cage length and an increased gear ratio of 34 teeth is thus not only faster than ever before, but also guarantees highly precise functionality under all conditions.

The built-in transmitter ensures wireless communication with the STI brake/shift levers ensuring podium-worthy, lightning-fast and precise shifting. Using Bluetooth and ANT+, it is also responsible for data transmission to the E-Tube Project and E-Tube Ride apps as well as to third-party devices.

Besides the charging port, the Top Normal rear derailleur features a button for certain Di2 settings and an LED for status display informing you about battery level, pairing and setting mode, for example.

Ports: 1x EW-SD300, 1x EW-EC300


Shadow RD

With their sophisticated technology, Shimano Shadow RD rear derailleurs are especially intended for more aggressive riding style. Their super low profile design carries many benefits. Thanks to the low profile and a single tension construction, the derailleur does not hit the chain stay in rough riding conditions. The result is smooth and silent performance.


Material: aluminium, stainless steel, steel, glass fiber reinforced polymer (CFRP)


STI lever: ST-R9250, ST-R9270, ST-R9160, ST-R9180, ST-R8150, ST-R8170, ST-R8060
cassette: CS-R9200, CS-R8100
chain: CN-M9100, CN-M8100, CN-M7100, CN-M6100

Weight: approx. 262 grams (manufacturer's specs)


Scope of supply:

rear derailleur incl. TL-EW300 cable connection tool

Fact Sheet of Shimano Ultegra Di2 RD-R8150 Rear Derailleur - 12-speed - black

Product Name: Shimano Ultegra Di2 RD-R8150 Rear Derailleur - 12-speed - black
Manufacturer: Shimano Parts
Item Code: SHI549913
activity: Cycling
material: Aluminium
usage bikesport: Road Bike
shifting system: 12-speed
shifting actuation: Electronic
smallest sprocket: 11
rear derailleur max. teeth: 34
rear derailleur capacity: 39
max. chainring spread teeth: 16
rear derailleur version: conventional
Model year: 2023
Color: Black
weight: 262g
manufacturer item code: IRDR8150A
Manufacturer page: