Shimano Ultegra Di2 RD-R8150 12-Speed Rear Derailleur

Product Description:
The Shimano Ultegra Di2 RD‑R8150 is the latest evolution of Shimano’s electronic shifting technology, delivering lightning‑fast, ultra‑precise 12‑speed shifting with exceptional reliability. This redesigned derailleur uses a single long‑cage configuration compatible with a wide range of cassettes, covering everything from 11‑28T to 11‑34T.

With a compact, integrated design and improved motor efficiency, the R8150 rear derailleur anchors the entire Ultegra Di2 12‑speed system. These units are OEM, brand new, never mounted, and supplied without retail packaging.

Key Features:
• Brand: Shimano
• Series: Ultegra Di2 R8150
• Model: RD‑R8150
• Part type: Rear derailleur
• Drivetrain: 12‑speed
• Cage length: Long
• Max low sprocket: 34T
• Min low sprocket: 28T
• Cassette range compatibility: 11‑28T to 11‑34T
• Material: Aluminum
• Color: Black
• Weight: 261 g
• Condition: New OEM, never installed
• MSRP: $470.00

Fitment Details:
• Compatible with road bikes and Shimano 12‑speed Di2 road drivetrains
• Works with Ultegra R8150 Di2 and Dura‑Ace R9250 Di2 (cross‑compatible cassette ranges)
• Mount type: Direct mount/standard hanger
• Ideal for endurance, performance road, and climbing‑focused setups

Performance Features:
• Ultra‑fast, precise electronic shifting
• Single cage length simplifies compatibility
• Supports wide‑range 11‑34T cassettes
• Improved motor efficiency and shift response
• Clean, compact design with integrated wiring ports
• Engineered for smooth, stable shifting under load