Shimano Ultegra Di2 IRD-R8150 12 Speed Rear Derailleur


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  • Our fastest ever rear shifting
  • Integrated wireless unit, charger, and switch
  • LED status indicator
  • Wider range capacity

Product Description

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.


  • Our fastest ever rear shifting, 58% faster than RD-R9150
  • Compact design includes an integrated wireless unit, charger, and switch
  • LED status indicator
  • Battery indicator
  • Pairing
  • Adjust mode, etc.
  • Wider range capacity
  • CFRP rear derailleur plate

Product Specification

Brand Shimano
What's in the box 1 x Shimano Ultegra Di2 IRD-R8150 12 Speed Rear Derailleur
Material Aluminium, stainless steel, steel, glass fiber reinforced polymer (CFRP)
Technology Shadow RD+, E-Tube, Using Bluetooth and ANT+
Shimano Series Ultegra Di2
Product Series R8100
Speed 12 Speed
Total Capacity 39T
Max. Front Difference 16T
Top Sprocket - Max 14T
Top Sprocket - Min 11T
Low Sprocket - Max 34T
Low Sprocket - Min 30T
Pulley Teeth 11T
Direct Mount Mount_Direct attachment (Conventional), Mount_Direct Mount, Top-normal spring type_SHIMANO SHADOW RD
Genre Road
Weight 262 gr
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