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Ultegra Dii2 how do you set up a triple

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Ultegra Dii2 how do you set up a triple

Old 07-14-15, 09:03 AM
  #26  
merlinextraligh
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Yes, sortof.

You can use the XTR with road shifters and get it to shift a triple. Problem is that you need to use the XTR FD, which is optimized for MTB chainrings. So if you want to run a 42-32-24. It will work.

But it's not designed to shift to a 52-53 tooth chainring.

The better answer is stay with Ultegra Di2, which will shift up to a 32 tooth cog, and if you need lower range than that, you can do the K Edge modification to the rear derailleur, and go as big as a 40 tooth cog.
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Old 07-14-15, 09:06 AM
  #27  
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Originally Posted by JakiChan View Post
Personally, I'd love a stock electronic RD that can do a wide range cassette. On my Roubaix right now I've got an 11-34 with an XTR RD. If there was a way to do the same thing with a stock electronic RD (not the K-Edge hacked RD) I'd do it in a heartbeat.
Stock Ultegra is spec'd for 32 teeth, and Shimano is always conservative about their capacity ratings, so it will shift a 34 tooth cog.

And why don't you like the K-Edge. All it does it swap out the cage for a longer cage, with the top pulley moved back.

We've got Dura Ace Di2 with the K-Edge adaption on our tandem. We're only running an 11-25 on it now, but it shifts great, with no discernable difference from a stock derailleur.
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Old 07-14-15, 09:10 AM
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Di2 will do a triple, and the road shifters are just buttons, so quite possibly ....

The XT(R) triple is 40-30-22T, so I am not sure that I would want to do that, but it sounds like it could be done.
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Old 07-14-15, 10:24 AM
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Honestly, I don't think hacking the DI2 would be hard at all. I bet the steps are stored in some memory on the device and it just moves a tiny stepper motor or servo to those positions every time you push the button. Modify the steps and BAM, you've got yourself a triple capable DI2 setup. Even if you CAN'T modify the memory (non rewriteable), as long as you could interface with the motor controller you could make the derailleurs move wherever you wanted them.

With the hardware, even I (a relative electronics newb) could program a tiny micro to do what you want. I bet the limitation for making something like this was the force needed to push the derailleur one way or another. (And making it reliable.)
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Old 07-14-15, 10:45 AM
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I think the problem, at least from Shimano's own point of view, is the FD and RD are designed to work together, and their (evil windows-only) software won't recognize the mix, at least according to the link I posted. The rear moves a little bit to fine-tune the shift when you change sprockets in the front. Reprogramming the firmware in such a way that the components are still recongized by each other isn't trivial.

Since the large sprocket of the XT(R) triple is only 40, it might be more practical and cost-effective to use say a 38-28T double. (FWIW, I am considering these options due to some lingering issues from an ankle break that make it hard to stand up on the pedals on really steep climbs).
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Old 07-14-15, 10:55 AM
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Originally Posted by wgscott View Post
I think the problem, at least from Shimano's own point of view, is the FD and RD are designed to work together, and their (evil windows-only) software won't recognize the mix, at least according to the link I posted. The rear moves a little bit to fine-tune the shift when you change sprockets in the front. Reprogramming the firmware in such a way that the components are still recongized by each other isn't trivial.
Oh I wasn't talking about modifying the firmware. The interaction between the derailleurs is easy. It's simply another servo. Every time you press the button it shifts BOTH a bit. So instead of having one set of numbers for the RD shifts, you have two, one set for the RD motor, and one set for the FD motor. Again, provided the steps are stored in memory and not in the firmware itself, it'd be an easy modification. If it's hard programmed in, it'd be more difficult, but certainly not impossible. At that point I'd simply write my own program to directly interface with both the FD and RD.

Heck, I don't know how these things actually work, but if it were me I'd program the derailleurs (especially the FD) to move a bit more than required for the shift, then move back after X amount of time to facilitate quick shifting. I'd even add "adjustment" buttons if, for some reason, the shifting was weird you could modify the motor positions for each gear on the fly. (Say if you bent your derailleur during a race.)

Sorry, I didn't mean to derail the thread. I get excited when people combine my hobbies. (Bikes and electronics.)
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Old 07-14-15, 11:30 AM
  #32  
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Originally Posted by corrado33 View Post
Heck, I don't know how these things actually work, but if it were me I'd program the derailleurs (especially the FD) to move a bit more than required for the shift, then move back after X amount of time to facilitate quick shifting. I'd even add "adjustment" buttons if, for some reason, the shifting was weird you could modify the motor positions for each gear on the fly. (Say if you bent your derailleur during a race.)
Di2 already does these things. The slight over-shift followed by a delayed trim is normal. Di2 has a fine tuning mode accessible on-the-fly if you need a micro adjustment after a wheel swap for example.
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Old 07-15-15, 12:08 PM
  #33  
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Originally Posted by merlinextraligh View Post
Stock Ultegra is spec'd for 32 teeth, and Shimano is always conservative about their capacity ratings, so it will shift a 34 tooth cog.

And why don't you like the K-Edge. All it does it swap out the cage for a longer cage, with the top pulley moved back.

We've got Dura Ace Di2 with the K-Edge adaption on our tandem. We're only running an 11-25 on it now, but it shifts great, with no discernable difference from a stock derailleur.
Well, among other things, they don't make it anymore.

That being said, I'm probably strong enough now that I would be fine with an 11-32. At the moment I'm only waiting to see the disc situation sort itself out.
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Old 07-15-15, 12:19 PM
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Originally Posted by JakiChan View Post
Well, among other things, they don't make it anymore.

That being said, I'm probably strong enough now that I would be fine with an 11-32. At the moment I'm only waiting to see the disc situation sort itself out.
Ultegra Di2 6870 GS is spec'd to handle 32 teeth. I'm pretty certain they still make it. It certainly is widely available.

Shimano Ultegra Di2 6870 GS Rear Derailleur 11-SPD
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Old 07-15-15, 03:27 PM
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Originally Posted by merlinextraligh View Post
Ultegra Di2 6870 GS is spec'd to handle 32 teeth. I'm pretty certain they still make it. It certainly is widely available.

Shimano Ultegra Di2 6870 GS Rear Derailleur 11-SPD
Sorry - I meant that I don't see the K-Edge RD mod on their website anymore. Stock 11-speed Ultegra will be what I probably do, however.
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