Shimano Ultegra RD-R8150 Di2 12-Speed Rear Derailleur — One-Spec Cage, 11-34T, Integrated Wireless, Road, Black

Shimano Ultegra RD-R8150 is a genuine Shimano rear derailleur delivering precise, reliable shifting for road bike riders.

Genuine Shimano Ultegra — brand new in retail packaging.

Will it fit? This is a 12-Speed rear derailleur (One-Spec Cage, 11-34T) for Shimano 12-Speed electronic Di2 road drivetrains — match speeds and cassette range. This is the derailleur only. It connects via EW-SD300 wiring to your bike's existing Di2 battery (BT-DN300 or compatible) — the battery, wires, shifters and charger are NOT included.

Key Specifications

Technology Highlights

• ✓ Di2 electronic shifting gives fast, precise, push-button gear changes every time.
• ✓ Semi-wireless Di2 sends the shift signal wirelessly for a cleaner cockpit.
• ✓ SHADOW RD low-profile design tucks the derailleur in for fewer impacts and crisp, consistent shifts.
• ✓ One-spec cage covers the full supported gear range.
• ✓ Optimized for 11-34T drivetrains.
• ✓ Genuine Shimano quality — consistent performance and durability.

What's in the Box

• 1 × Shimano Ultegra RD-R8150 rear derailleur (derailleur only)
• Mounting bolt & documentation (as supplied by Shimano)
• Original Shimano retail packaging
• Not included: Di2 battery (BT-DN300), wiring (EW-SD300), shifters, or charger