Shimano Dura-Ace Di2 RD-7970 Rear Derailleur. The revolutionary Dura-Ace Di2 electronic shifting option with SEIS (Shimano Electronic Intelligent System) takes the already superior Shimano shifting performance to a whole new level never seen before. The increased accuracy, smoothness and reliability of electronic shifting makes gear changes faster and virtually eliminates missed shifts. Through SEIS, the electronic rear derailleur is the fastest & most precise shifting available for the road. In addition, the carbon pulley plate is lightweight and rigid while adding a dash of style.

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Features & Specs:

Saver function | Inner structure is protected from excessive damage

Titanium B axle | Lightweight

Electronic adjustment | Easy adjustment

Carbon link plate | Lightweight

Wide gear ratio | 27T max

Programmed motion | Smooth & precise

Maximum Sprocket: 27T

Minimum Sprocket: 11T

Maximum Front Difference: 16 teeth or less

Total Capacity: 32 teeth or less

Bracket Body: Aluminum

Plate Body: Engineering Composite

Outer Link: Aluminum

Inner Link: Aluminum

Outer Plate: Carbon

Inner Plate: Carbon

Average Weight: 225g

UPC: 689228278622
Manufacturer Part Number: IRD7970SS