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  • Shimano Ultegra Di2 6770 10 Speed Rear Mech
  • Shimano Ultegra Di2 6770 10 Speed Rear Mech

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Professional riders have been using the Shimano Dura-Ace components with Di2 electronic shifting technology in the biggest races in the world over the past four years: over the highest mountains, in the most extreme weather conditions and over the worst possible roads and cyclo cross tracks. Now it is time to introduce this revolutionary technology into the Shimano Ultegra, making it available to a much wider group of road racers and enthusiasts.

The advantages of Di2 (Digital Integrated Intelligence) are clear for everybody who has tested it: changing gears becomes easier, effortless and faster by simply touching the shift buttons. Control at the top of your fingers. Additional benefits include an automatic trimming front derailleur, unmatched precision plus super easy installation and adjustment.

The electric cables include only two core wires (DURA-ACE Di2 has four) and the connectors are smaller too with a diameter of 5.1mm (-3.7mm compared to DURAACE Di2). Easy plug and play system to connect the cables, which will be available in different lengths to accommodate most frame dimensions. Connection with PC for diagnosis and changing the shifting order.

The SEIS (Shimano Electronic Intelligence System) is based on the Shimano Index System (SIS) that has proved its superior gear changing characteristics over the years. The big difference is that in this case, the shifting action is provided for by electronics instead of mechanics.

Ultegra 6770 products will exclusively become available in the new Ultegra glossy grey color. The products are not compatible with Dura-ace Di2.


RD-6770 Rear Derailleur (10-speed)
• Fast, precise and smooth electronic shifting – even under load
• Easy electronic adjustment system
• Crash saver function
• Wide gear ratio – Compatible with 11-28T cassette sprockets
• Weight: 270g
Rated 3 out of 5 by 1 reviewer.
Rated 3 out of 5 by 微妙 XTR装着のクロスバイクから6770装着のロードへの乗り換えのため、RD-M970との比較。 変速は遅く、変速性能も低下。また、段によって変速のバラつきが大きく出ます。正直、変速性能や操作感ならワイヤーだと思います。 耐久性は低く、半年くらいでB軸の周りの部分が割れて、車体から外れてフレームが割れました。 しかし、デメリットだけではなくSTIはブレーキを含めて操作性に優れますので、曖昧な変速感を許容出来る方なら良い製品だと思います。 25 November 2013
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I understand that my current rear derailleur (Ultegra Di2), is only compatible up to a maximum of 28T, however I am doing a race with huge hills over a long distance and wanted to try a 30T option rather than swapping out the standard crank for a compact. What are the available options from a Di rear derailleur perspective?
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7 months ago
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East Lindfield,AU
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Answers

Answer: 
Both the Ultegra and Dura Ace Di2 rear mechs are only compatible with a 28T.

You will need to look at changing your front chainrings.
7 months ago
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