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The new boss.
Shimano’s latest electronic rear derailleur, the Dura-Ace 9070 seen here, represents the pinnacle of bicycle and electronic engineering. The biggest difference between this and the previous generation of electronic Dura-Ace is the switch to the E-Tube connectors that first made an appearance on Ultegra-level bits. This makes compatibility and programmability consistent across each of Shimano’s electronic groups and allows a near-infinite level of customization. The derailleur you see here will auto-adjust itself, move itself out of the way in the event of a crash, and handle up to a 28-tooth cog. If you’re putting together a dream build, Di2 is the icing on the cake.
- 11-speed derailleur with a 28-tooth maximum cog
- Programmable shifting
- Simplified cable routing over 7970
- Item #SHI0620
- Q & A
Having used Ultegra Di2 on a couple of other bikes, I was ready to step up to the Dura Ace version. Lighter, crisper and more durable. Can't wait to use it this spring.
- Familiarity: I've put it through the wringer
Need I say more? A little tight on the clearance with my Tune DC14 skewer nut but that DA doe...
does this component come with the shimano tool that is needed to plug / unplug the wiring from the component?
No, but the shifters come with the tool.
Is it actually correct to state that "9070...
Is it actually correct to state that "9070 operates with both 10- and 11-speed cassettes"? Emailing Shimano directly resulted in the advice from their Technical Support team that the only way to run the new 9070 Di2 system with a 10-speed drivetrain is to use the Ui2 derailleur. RD-9070 only works with a 11-speed drivetrain. Can you confirm what's the actual situation and how, if possible, 9070 Di2 can be made to run 10-speed?
I believe I'm correct that there is no way to configure it to run with a 10spd cassette. However, that said, I think you could probably "hack" it, by adjusting the high or low limit screw to stop at cog # 1 or 10, either highest or lowest. If you then shifted beyond that, the derailleur will hit against the screw and not go anywhere. You would then have to push it twice to shift in the other direction. but why don't you just buy an 11 cog cassette? If you're wheel hub won't accept an 11spd cassette, you can probably buy a new cassette body from the hub manufacturer. I did that for my wife's American Classic wheel. (Note: the wheel will need to be redished if you install a larger cassette body.)