Shimano Ultegra RD-R8150 Di2 Rear Derailleur - 12-Speed

Shimano Ultegra RD-R8150F Di2 Rear Derailleur - 12-Speed Shimano

Shimano Ultegra RD-R8150 Di2 Rear Derailleur - 12-Speed

Shimano Ultegra RD-R8150 Di2 Rear Derailleur - 12-Speed

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Is the Shimano Ultegra RD-R8150 Di2 the Right Rear Derailleur for Your Build?

The Shimano Ultegra RD-R8150 brings the same generational leap as the Dura-Ace RD-R9250 to the Ultegra tier, with 58% faster shifting than the previous generation, a carbon cage, and the fully integrated D-FLY wireless hub that consolidates the charging port, Bluetooth LE and ANT+ connectivity, LED status indicator, and function button directly into the derailleur body. No separate junction box is needed. The compact Shadow RD low-profile design reduces the derailleur's footprint and exposure, and a single cage length covers 11-28t, 11-30t, and 11-34t cassettes in one derailleur.

Part of the Shimano Ultegra R8100 semi-wireless Di2 system. The derailleur connects to the BT-DN300 battery via EW-SD300 E-Tube wire while shift commands arrive wirelessly from the ST-R8170 levers. Full tuning and synchronized shifting configuration via E-Tube Project app over Bluetooth or ANT+. Compatible with 12-speed Ultegra Di2 and Dura-Ace R9200 Di2. Not compatible with 11-speed Di2 or mechanical.

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$417.99
$417.99 $470.00
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  • Estimated delivery: Aug 16 - Aug 20

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more details:

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Specifications

  • MPN: IRDR8150F
  • Speed: 12-speed
  • Shift System: Shimano Di2 (Electronic, Semi-Wireless)
  • Cage: Single length (carbon fiber)
  • Max Low Sprocket: 34t
  • Min Low Sprocket: 30t
  • Total Capacity: 39t
  • Top Sprocket Range: 11-14t
  • Weight: 262g
  • Wireless: Bluetooth LE and ANT+ (D-FLY integrated)
  • Charging: Integrated port (EW-EC300 cable)
  • Mount: Direct attachment or Direct Mount
  • Fluoric Coated Link Bushings: 4
  • Color: Black

FAQ

Do I need a separate junction box with the RD-R8150?

No. Like the RD-R9250, the charging port, D-FLY wireless unit, LED indicator, and function button are all built into the derailleur body. A junction box is not required.

Is the RD-R8150 compatible with 11-speed Di2?

No. The RD-R8150 requires 12-speed Di2 components throughout and will not work with 11-speed Di2 or mechanical systems.

Can I use the RD-R8150 with Dura-Ace R9200 components?

Yes. Ultegra R8100 and Dura-Ace R9200 are cross-compatible within the 12-speed Di2 ecosystem.

Best For

Road cyclists building or upgrading to a 12-speed Shimano Ultegra Di2 drivetrain who want flagship-level electronic shifting performance without the Dura-Ace price point.

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