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PostPosted: Wed Jul 17, 2013 3:21 pm 
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I am considering updating my TT bike from mechanical to the Di2. I have the Super-9 10-speed which is not convertible to 11-speed and I have never found the need for the 11-speed (at least on the TT bike). If I was to get the 2013 9070 series Di2, could it be "programmed" to work in a 10-speed mode?

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PostPosted: Wed Jul 17, 2013 3:25 pm 
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Good question! Can't wait to hear the answer.


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PostPosted: Wed Jul 17, 2013 3:42 pm 
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Per Shimano, it's all controlled by the rear derailleur. If you want to use e-tube technology (ie Ultegra 6700, not DA 7900), then your only 10-speed Di2 option is Ultegra 6700. Now, if you don't mind having the "older" technology of DA, then 7900 is an option, unless you don't mind running mismatched components (Ultegra 6700 rear derailleur, DA900 everything else).

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PostPosted: Wed Jul 17, 2013 3:46 pm 
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Makes sense
Thx much

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PostPosted: Fri Jul 19, 2013 8:45 am 
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yep you can just plug a 6700 rear mech in and it will work as 10 speed


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PostPosted: Fri Jul 19, 2013 3:36 pm 
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With no experience but lots of reading on the matter, I have gotten the impression that the benefit of e-tube and 9070 Di2 was that the controller could be re-programmed using Shimano's firmware update software. Now the Ultegra Di2 rear derailleur's geometry limits it to 10-speed operation, but I am pretty sure that the 9070 can be programmed to shift either 10 or 11-speed drive trains, presumably for those with high end wheels that cannot be re-dished (i.e Lightweight, Reynolds RZR).

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PostPosted: Sat Jul 20, 2013 9:25 pm 
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No you cannot reprogram it to 10 speed


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PostPosted: Mon Jul 22, 2013 3:10 pm 
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dale79 wrote:
No you cannot reprogram it to 10 speed
Thanks, I stand corrected. I based my assertions on a article I had read about Shimano's latest firmware that seemed to imply one could push the current 10-speed Ultegra Di2 configuration to a 9070 Di2 system thus affording 10-speed shifting in case one needed to use a non 11-speed rear wheel.

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PostPosted: Mon Jul 22, 2013 3:19 pm 
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dale79 wrote:
No you cannot reprogram it to 10 speed


Second confirmation on this. When I got my 9070 there was for a while some doubt about being able to re-dish a wheel I have for 11 speed and we looked into programming it for 10 speed as a backup plan for the short term. Shimano confirmed it wasn't possible. This is unfortunate and I have a hard time imagining that Shimano couldn't address this via firmware. The fundamental idea of a servo moter is that it has a flexible range of movement. I can't see any reason why the 9070 RD can't be programmed to 10 speed step increments instead of 11, but as of today it can't be done.


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PostPosted: Mon Jul 22, 2013 3:32 pm 
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I'm sure it can be reprogrammed, but not by Shimano. They're in the business of pushing new components, not letting you use new tech on old stuff. Find a wiz kid, and i'm sure that they'll eventually be able to program it to 10-speed, but don't ask Shimano for help with it.

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PostPosted: Tue Jul 23, 2013 12:33 pm 
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Why not just wind in a limit screw so that the 11th speed (i.e. 10th shift) can't engage?...


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PostPosted: Tue Jul 23, 2013 1:41 pm 
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For the same reason you cant use 10-speed shifters for a 9-speed drive train, cassette spacing is narrower.

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PostPosted: Tue Jul 23, 2013 2:38 pm 
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It could be possible -

http://velonews.competitor.com/2012/07/bikes-and-tech/technical-faq/technical-faq-how-does-di2-know_228686


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PostPosted: Tue Jul 23, 2013 8:20 pm 
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The content in that VN article was where I had gotten the assertion about being able to program an e-tube DuraAce 9070 rear derailleur as either 10-speed or 11-speed.

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PostPosted: Wed Jul 24, 2013 5:28 pm 
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I was referring to BikeTart's comment about adjusting the limit screw. I'd remembered reading that Wayne Stetina was at one point riding a 9000 setup as 10spd.

The article mentions the use of a 10spd cassette and an 11spd cassette converted to 10spd so shouldn't it also apply to 9070?


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