Shimano Ultegra Di2 Rear Derailleur Bracket Axle Unit
Best replacement component for cyclists maintaining high performance electronic drivetrains.
A critical factory replacement part that restores proper derailleur alignment and shifting precision. This kit includes all necessary hardware to securely mount the derailleur to the frame, ensuring reliable performance after a crash or wear-related damage.
$54.90
More Ultegra options
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Shimano Di2 RD-R8050-SS Rear Derailleur
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Shimano Ultegra R8000 Front Derailleur
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Shimano Ultegra R8000 Rear Derailleur
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Shimano Ultegra R8150 Di2 Front Derailleur
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Shimano Ultegra Rear Derailleur
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Shimano Ultegra Di2 Front Derailleur
$295.00
Shimano Ultegra R8050 Di2 Rear Derailleur
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Shimano Ultegra FD-R8000 Front Derailleur Link Cover
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Shimano Ultegra FD-R8050
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Shimano Ultegra RX800 Rear Derailleur
$117.99
Shimano Ultegra RX
$129.60
Shimano Ultegra Rear Derailleur
$90.00
Shimano Ultegra R8000 Front Derailleur
$65.00
Shimano Ultegra RD-R8150F Di2 Rear Derailleur
$470.00
Shimano Ultegra RD-R8000-GS
$125.00
Shimano Ultegra Front Derailleur Clamp Shim
$51.99
Shimano Ultegra Rear Derailleur
$44.10
Shimano Ultegra R8050 Di2 Rear Derailleur
$289.99
Shimano Ultegra FD-R8000 Front Derailleur
$56.25
Shimano Ultegra FD-R8000
$75.00
Shimano Ultegra RD-R8150F Di2 Rear Derailleur
$470.00
Shimano RD-RX805-GS Bracket Axle Unit
$44.10
Shimano Ultegra 6800 Front Derailleur
$67.49
Shimano Ultegra RD-X805 Di2
$284.99
Shimano Ultegra FD-6700-G Front Derailleur
$60.99
Shimano Ultegra RD-R8000-SS Rear Derailleur
$115.00
Shimano Ultegra RD-6800 Rear Derailleur
$100.99
Who it's for
- Performance cyclists seeking factory-standard shifting accuracy
- Long-distance riders prioritizing component longevity and reliability
- Home mechanics performing their own drivetrain maintenance
Who should skip it
- Cyclists using non-Ultegra or older mechanical drivetrains
- Novice riders without experience in complex derailleur servicing
- Budget-conscious commuters looking for the most inexpensive repair options
Performance breakdown
Alignment Precision
Restores factory-spec geometry for crisp, reliable electronic shifting performance.
Material Durability
High-grade alloy construction withstands the rigors of daily high-performance riding.
Installation Ease
Straightforward swap that gets your drivetrain back on the road quickly.
Component Compatibility
Perfectly engineered fit for specific Ultegra and GRX Di2 derailleur models.
Hardware Completeness
Includes every bolt and bracket needed for a seamless, secure installation.
Shift Responsiveness
Eliminates slop to ensure every Di2 command translates into instant gear changes.
Key Specs
Compatibility
Shimano RD-R8150 Ultegra Di2
Compatibility
Shimano RD-RX825 GRX Di2
Mount Type
Hanger
Derailleur Position
Rear
Includes
Bracket, derailleur hanger bolt, B-Axle bolt
Know before you buy
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