Dura Ace RD-R9150 Di2 Rear Derailleur

The SHIMANO Dura Ace RD-9150 rear derailleur effectively supports you to get the best out of yourself – in both training and of course competitions.
Therefore, the programmable Synchro-Shift feature allows you to adjust the rear derailleur in combination with the FD-R9150 front derailleur with a touch of a button and to stay focused on the racing situation.
In the Full Synchro-Shift mode, the front shifting is automatically controlled based on your rear gear use. The Semi Synchro-Shift mode can be set up to adjust your rear gear position based on your manual front chainring choice. So, shifting at the front will enact automatic shifts at the back to keep a consistent cadence.

Details:
Precise, lightning-fast shifting under all conditions
Compatible with Synchro-Shift: shifting front and rear derailleur with only one lever
Program-controlled shifting movement: faster and smoother shifting with reduced risk of chain drop
Shadow RD design: flat design for a clean look, stable shifting and resistance in case of a fall
“Wide Link” design for increased stiffness
Compatible with Direct Mount

Technical details:
Intended use: Road
Series: Dura Ace Di2
Model: RD-R9150
Material: aluminium/carbon/carbon fibre-reinforced plastic/stainless steel
Compatibility: 11-speed
Largest sprocket max.: 30 teeth
Largest sprocket min.: 25 teeth
Smallest sprocket max.: 14 teeth
Smallest sprocket min.: 11 teeth
Max. front difference: 16 teeth
Total capacity: 33 teeth
Slots: 1 EW-SD50 E-Tube Ports
Weight: approx. 197 g

In the box:
1 SHIMANO Dura-Ace RD-R9150 Di2 rear derailleur