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DIY Ultegra Di2 TT

 

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locutus

Jan 31, 12 20:08

Post #1 of 293 (36222 views)
DIY Ultegra Di2 TT Quote | Reply

Since I could not wait the few more months for the TT version of ultegra di2 to come out I decided to try and make my own. Long story short, it can be done fairly simply. Ultegra di2 uses canbus protocol for communicating between the derailluers, shifters, and even the battery mount. So, in order to make tt shifters, I used the STI shifters for its parts. The STI shifters have a small circuit board connected to the x/y shifter buttons on the paddles. The switches on the sti shifters are simple momentary switches with a common and up & down wires (three in total). All that is needed is the small circuit board and the wires coming from it to the paddles. The x/y buttons can be replaced by any momentary switch. For my project, I mounted the circuit board and switches into a section of the aero bar. Satellite shifters can easily be added in by splicing into the new switch circuit. From there, installation for the rest of the components are the same.

A few things I found....the harness is only made up of two wires so if youre good with a soldering iron, you dont need the junction box or 4 separate shimano wires...you only need the plugs and the rest can be made. Additionally, since even the battery mount communicates with the rest of the system, you cant simply put a battery inline like with dura ace di2. You can, however, use your battery of choice and just run the leads to the mount. I placed the mount under the seat and put the battery in the seat post.

It was a fun project and fairly easy. Ill post some pictures below!!








leedlete

Jan 31, 12 20:20

Post #2 of 293 (36187 views)
Re: DIY Ultegra Di2 TT [locutus] [In reply to] Quote | Reply

Awesome!


jayare

Jan 31, 12 20:32

Post #3 of 293 (36159 views)
Re: DIY Ultegra Di2 TT [locutus] [In reply to] Quote | Reply

How much did this cost you? How well does it perform?
.
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Tai

Jan 31, 12 20:34

Post #4 of 293 (36158 views)
Re: DIY Ultegra Di2 TT [locutus] [In reply to] Quote | Reply

very nice! just curious, the small board that you referred to from the shifters. Do you think that was a control board? If so, did you happen to notice if anything looked proprietary? Just wondering if it would be possible to just set up your own board versus cannibalizing a pair of STI shifters (I might have misunderstood, maybe you didn't do that) for the board. I actually didn't think you needed a control board so hopefully I'm misunderstanding you.

Very clean setup. I was debating doing this and was trying to figure out where the best spot for the shifter buttons really is. Would it be where you put it and Shimano puts it would a rocker dpdt switch mounted un the underside at the tip possibly work better. You could even hide the buttons under the bar tape...!
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locutus

Jan 31, 12 20:37

Post #5 of 293 (36152 views)
Re: DIY Ultegra Di2 TT [jayare] [In reply to] Quote | Reply

I got everything from nasbar for about 1000. Could probably have pieced it together cheaper by buying of ebay though. As far as performance goes, I dont have the chain on yet but it should perform as well as di2 should since the only thing that was modified was the shifters.


locutus

Jan 31, 12 20:43

Post #6 of 293 (36136 views)
Re: DIY Ultegra Di2 TT [Tai] [In reply to] Quote | Reply

Hello, right now you definitely need to part out the sti shifters. The circuit board (which is probably better described as a black box) converts the signal from the momentaries to canbus. From what ive read, it is proprietary and cant be found off the shelf. I was thinking about using a spdt center off paddle switch but decided on these instead since theyre water proof and easily available. But pretty much any momentary switch will work...for satellite shifters, just wire them in parallel


styrrell

Jan 31, 12 20:48

Post #7 of 293 (36125 views)
Re: DIY Ultegra Di2 TT [locutus] [In reply to] Quote | Reply

Which shifter is the black box in (L or R?)
Styrrell


locutus

Jan 31, 12 20:50

Post #8 of 293 (36120 views)
Re: DIY Ultegra Di2 TT [styrrell] [In reply to] Quote | Reply

They are in both shifters (you can see the black box in the shifter pic i posted). They are small, like about 1 cubic inch and the wires plug directly into them. Come to think of it, a budget build could be done by doing rear shifting only...then all youd need is the r shifter, rear derailleur, and battery mount.


(This post was edited by locutus on Jan 31, 12 20:52)


tetonrider

Jan 31, 12 21:26

Post #9 of 293 (36074 views)
Re: DIY Ultegra Di2 TT [locutus] [In reply to] Quote | Reply

locutus wrote:
They are in both shifters (you can see the black box in the shifter pic i posted). They are small, like about 1 cubic inch and the wires plug directly into them. Come to think of it, a budget build could be done by doing rear shifting only...then all youd need is the r shifter, rear derailleur, and battery mount.

nice work. in my opinion, one of the best elements of di2 is on a TT/tri bike--shifting at the horns. you can right that up, i'm sure, but it's a really strong aspect of DA di2.


realtalk411

Jan 31, 12 21:30

Post #10 of 293 (36063 views)
Re: DIY Ultegra Di2 TT [locutus] [In reply to] Quote | Reply

Nice! Can't wait to see how it works with the chain on.

I'm kind of split on whether to just go with a SHIV Comp and wait for Ultegra Di2 to come out (hopefully it will fit) or SHIV Elite/Pro... Your set-up makes me want to wait especially if it's at the $1,000 mark~


locutus

Jan 31, 12 21:32

Post #11 of 293 (36058 views)
Re: DIY Ultegra Di2 TT [tetonrider] [In reply to] Quote | Reply

I agree. I also put momentary switches by the levers (left up, right down). Satellites can be rigged up anywhere. One thing about ultegra that's better than dura ace is the wire diameter...it's only 5mm compared to 8mm which makes routing a lot easier.


tetonrider

Jan 31, 12 21:59

Post #12 of 293 (36032 views)
Re: DIY Ultegra Di2 TT [locutus] [In reply to] Quote | Reply

locutus wrote:
I agree. I also put momentary switches by the levers (left up, right down). Satellites can be rigged up anywhere. One thing about ultegra that's better than dura ace is the wire diameter...it's only 5mm compared to 8mm which makes routing a lot easier.

wire diameter on da di2 is 2.5-3.5mm, depending on the wire.

i think you mean connector diameter. the smaller connectors on di2 are ~5.5mm, but some are larger, which is the problem -- it's not the wire diameter.


nauqneyugn

Jan 31, 12 23:09

Post #13 of 293 (35960 views)
Re: DIY Ultegra Di2 TT [locutus] [In reply to] Quote | Reply

Really like how open source Di2 is. Great stuff!


chuckjg112

Feb 1, 12 7:55

Post #14 of 293 (35636 views)
Re: DIY Ultegra Di2 TT [locutus] [In reply to] Quote | Reply

That is awesome! I have been following a thread over on fairwheel bikes that suggest Di2 ultegra is much tougher to do these mods. I'm glad to see your work.

Keep the info coming


Herbert

Feb 1, 12 8:05

Post #15 of 293 (35612 views)
Re: DIY Ultegra Di2 TT [locutus] [In reply to] Quote | Reply

Very cool


camaleon

Feb 1, 12 8:10

Post #16 of 293 (35505 views)
Re: DIY Ultegra Di2 TT [locutus] [In reply to] Quote | Reply

shimano is going to be so happy about it...

----------------
Often times, the quality work are hard stuff and stuff that you don't want to do, and as a result, too many people end up doing a ton of work they don't need and not enough of the stuff they do need. - echappist


styrrell

Feb 1, 12 8:18

Post #17 of 293 (35382 views)
Re: DIY Ultegra Di2 TT [camaleon] [In reply to] Quote | Reply

I dont think they will care much. The shift buttons themselves are very cheap, but to get it to work you need to buy a $450 road shifter set to cannabilize for the electronic modules. I doubt many people are going to copy locutus' very nice work. Shimano could have very easily put the electronics in the deraileurs, then you could easily make your own TT shifters. I don't think the descision was by chance.

Now if someone can come up with a reasonably priced control module, then I think shimano might not be happy.
Styrrell


Herbert

Feb 1, 12 8:20

Post #18 of 293 (35362 views)
Re: DIY Ultegra Di2 TT [locutus] [In reply to] Quote | Reply

PM me your address and I'll send you a couple of the brand new Specialized Hydroflo slowtwitch bottles for starting this very neat thread.




We got a whole box that eventually will find homes in forum users places. :-)


mrtrik

Feb 1, 12 8:30

Post #19 of 293 (35242 views)
Re: DIY Ultegra Di2 TT [locutus] [In reply to] Quote | Reply

nicely done.

2 thumbs up

--
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Ted Striker

Feb 1, 12 8:45

Post #20 of 293 (35106 views)
Re: DIY Ultegra Di2 TT [locutus] [In reply to] Quote | Reply

Thoroughly impressed. Very nice!!!
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Aralo

Feb 1, 12 8:45

Post #21 of 293 (35102 views)
Re: DIY Ultegra Di2 TT [locutus] [In reply to] Quote | Reply

locutus wrote:
Ultegra di2 uses canbus protocol
Do you have the spec for the message that are used (and bus rate etc) or did you reverse engineer it? I'm very interested in more details about the electronics if you're willing to share. Cool project!


DC Pattie

Feb 1, 12 8:50

Post #22 of 293 (35045 views)
Re: DIY Ultegra Di2 TT [locutus] [In reply to] Quote | Reply

That is totally awesome. I'm guessing you could also use your protocol for a MTN bike XTR version?


AndyF

Feb 1, 12 9:01

Post #23 of 293 (34947 views)
Re: DIY Ultegra Di2 TT [locutus] [In reply to] Quote | Reply

Can you please PM me? I have a few technical questions.

AndyF
http://alphamantis.com


lemond853

Feb 1, 12 9:02

Post #24 of 293 (34940 views)
Re: DIY Ultegra Di2 TT [locutus] [In reply to] Quote | Reply

How much damage did you do to the STI levers? Do you think you could rebuild them if necessary?

I'm asking because I'm wondering it this a reasonable approach to take in order to add DIY remote shifting to a road bike with Ultegra Di2: pull the module, solder on additional leads for more buttons, reinstall the module.

Great work,

Scott

ps. I also wonder if the module might some day be available as part of repair assembly.


RoninSherpa

Feb 1, 12 9:08

Post #25 of 293 (34893 views)
Re: DIY Ultegra Di2 TT [locutus] [In reply to] Quote | Reply

I bet Locutus has a beard.

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