Spin Doctor Tech Tip – Shimano Dura-Ace Di2 Electronic Shift System

So you’ve won the lottery and your first big purchase is Shimano’s new electronic Dura-Ace Di2 drivetrain.

Before you install it, BE ADVISED that your ego may be put in jeopardy. Yes, the new Di2 components are so slick that your bike, once Di2 adorned, will be smarter than you. Push a button and you have perfect shifts every time. The front derailleur will automatically trim itself to eliminate cross chain rubbing, and the rear derailleur disconnects its motor when you lay the bike down. The system will even tell you when the battery is low or if there’s a malfunction. Plus the battery lasts 1000 KM and will recharge in only 90 minutes.

Like we said, this stuff is SWEET!

Even better, Dura-Ace Di2 meets the “clock on the VCR” standard. If you can program the clock on your VCR, installation of Di2 will be a snap. The components come with good, clear installation and set-up instructions plus Shimano has an even better online tutorial, http://di2certified.shimano.com. That site features both a how-to video and an interactive installation and operation lesson.

But there are a few small subtleties that, if missed, can short circuit Di2’s marvelous performance.

Be aware of these issues:

• Do not touch the cable connector terminal/contacts. The system is great but can malfunction if the contacts are fouled.

RD-7970 rear derailleur

• The RD-7970 rear derailleur will  accommodate cassette cogs as large as 27 teeth, no bigger. Do not be tempted to install the new Dura-Ace 7900 11-28 cassette; it will hang up.

SM-BTR1 battery pack

• Be sure to remove the battery when installing the derailleurs or repositioning them. The motors in the derailleurs are powerful enough to break or badly pinch a finger.

FD-7970 front derailleur

• If you are installing the FD-7970 front derailleur on a braze-on mount, be sure to use the provided small stainless steel patch to protect your frame. The FD-7970 uses a “support bolt” that screws against the frame to orient the cage relative to the crank. The support bolt will damage the frame if you have failed to attach the protector.

TL-EW01 tool

Removing rear derailleur connector

• The wiring harness comes with a plastic tool (TL-EW01) to plug the wiring harness electrical connectors into the brake levers/shifters. It is also to be used to disconnect any of Di2’s electrical connectors. Use the tool! Do not pull connectors apart.

ST-7970 dual control levers

Auxiliary terminals

• The ST-7970 brake levers/shifters have additional terminals for auxiliary shifter buttons. If you are not going to use them, seal them from the weather by installing the provided dummy plugs.

• The new CN-7900 chain is asymmetrical and shifts great when correctly oriented. Install it so that the non-perforated outer plate (engraved with Shimano & Dura-Ace logos) is on the outside.

• When properly assembled the Di2 system is extremely waterproof, but individual components require special care when cleaning:

  • Do not soak components in degreaser. This may damage critical seals.
  • Shimano recommends cleaning components with a rag soaked in mild degreaser. Do not use a spray or brush, as they can damage the seals.
  • The articulated joints & pivots of the Di2 front and rear derailleurs are connected to the internal servo motors. Lubricating these pivots may damage seals and expose the motor to contamination.
  • Maintenance of the pulley can be done in the same way as with a conventional derailleur.
2010 Scattante CFR Pro

2010 Scattante CFR Pro Shimano Dura-Ace Di2 Road Bike

So what was the test rig here in our office to learn all about Dura-Ace Di2? None other than our very own 2010 Scattante CFR Pro Shimano Dura-Ace Di2 Road Bike (seen here in our Technical Support area). Featuring our brand new sub-1000g CFR-A3 Frame, with BB30 crankset, this is definitely a worthy ride upon which to hang a complete Dura-Ace Di2 drivetrain.

46 Responses to Spin Doctor Tech Tip – Shimano Dura-Ace Di2 Electronic Shift System

  1. Derrick says:

    Have had my Di2 for about 6 months now and love it, I am looking to change from 12-25 cassette to 11-27 or 11-28. You noted above that the 11-28 will hang, Shimano’s site lists that the rear derailuer can handle up to 28 cog, have there been a lot problems with the 28’s now that they have been out a while? Any similar trouble with the 11-27’s? I need all the climbing help I can get.

    • Talked to our tech team, and they said that the maximum rear sprocket officially sanctioned by Shimano for the Di2 rear derailleur was 27 teeth (with a total capacity of 32 teeth or less). Now you could probably make it work with 28 teeth, but you will probably have to adjust the B screw and you may not get the absolute finest shifts (and that’s what you want from Di2). Long story short, you can go up to 27 teeth with no problems, even with a compact crankset. Hope this helps.

  2. Hiran says:

    We run it with a 36 on our race bikes so it can be made to work :-)

  3. Angus McCulloch says:

    I have UDi2 but find the rear derailleur does not shift as smoothly from smallest cog to second smallest as it does with the rest of the rear cogs. I have it set up and adjusted as per the workshop manual. I am using a KMC silver 10speed chain and not an Ultegra chain. But the thickness of chain is the same. Could the chain be the issue?
    The shifting takes a bit longer and just sounds bad as it sounds like a chain that will not shift.

  4. Eli says:

    i just got the di2 ultegra, works great my concerns are about daily maintenance for example;
    if it gets rained on and in sth florida it can happen at anytime. just basic cleaning and lubrication of the system; when, how and what is and is not recommended to use if anything?

  5. Dennis Page says:

    Just got a brand new Scott premium with dura ace di2 and rear dérailleur failed on the second day. Battery is fully charge, tried to hold reset for 5 sec and rear dérailleur will shift all the way down and then back up. When I try to shift I get no response from rear. The front works well. I also disconnected the wires and then plug them backin again.
    Will take it back to the bike shop tomorrow but that’s very frustrating.

  6. Matt says:

    I have Dura Ace DI2 7970.I recently changed from a Dura Ace 7900 12-27 cassette to an 11-28 when I switched to compact cranks. While Shimano recommend a 27max the 28 works just fine with a small adjustment of the B screw. There has been no change to shift quality. Hope this helps…

  7. A good contractor will also be willing too meet with youu to discuss
    your roof and he will be enthusiastic about getting the job.
    If you hope to have your deductible covered, or possibly even make money offf
    the claim, think again. Operate installed appliances within the temperature
    limits set by the manufacturer.

  8. Manie says:

    This will act aas an added protection on your roof, aand with its help, you ccan be
    assured that your roof will last longer than average. When looking into you home insurance and its likelihood of covering the cst of a new
    roof, remember that most insurance policies will cover it if the damage is ggrave enough.
    This is where safety harnesses and assist lines are mandatory.

  9. Wow that was strange. I just wrote an extremely long comment but after I clicked submit my conment didn’t show up.

    Grrrr… well I’m not writing all thaat over again. Anyways, just wanted to say
    great blog!

  10. This is a very good tip particularly to those new to
    the blogosphere. Brief but very accurate information…
    Thank you for sharing this one. A must read post!

  11. Awesome issues here. I am very satisfied to peer your post.
    Thanks so much and I’m having a look forward to contact you.
    Will you kindly drop me a mail?

  12. Hurrah, that’s what I was seeking for, what a material!
    existing here at this website, thanks admin of this web site.

  13. Hi there, just became alert to your blog through Google, and found
    that it’s really informative. I’m gonna watch out for brussels.
    I will be grateful if you continue this in future. Many people will be benefited from your writing.
    Cheers!

  14. Laurence says:

    How about providing oil changes for those driving
    to the food bank to pick up food for the week. To start with,
    know what project types your loved one likes. This will prevent you
    from buying drain cleaners and plumbers in the future.

  15. I think the admin of this web site is actually working hard in support
    of his website, as here every data is quality based material.

  16. Now the question that may come to your mind is that you may ask how the
    sites earn money when they do not charge any amount from the movie buffs.
    You get what you pay for and when paying nothing, you can’t really complain. To break free from the chain of limitations, a movie buff can opt
    to view movies online.

  17. obviously like your website however you have to check the spelling on quite
    a few of your posts. A number of them are rife with spelling
    issues and I find it very troublesome to inform the reality nevertheless I will certainly come again again.

  18. Hi, I would like to subscribe for this web site to obtain newest updates,
    therefore where can i do it please assist.

  19. Hey there! This post could not be written any better!

    Reading through this post reminds me of my previous room mate!
    He always kept chatting about this. I will forward this page to him.
    Pretty sure he will have a good read. Thanks for sharing!

  20. This post presents clear idea ffor the new
    viewers of blogging, that truly how to do blogging.

  21. Tanesha says:

    Hi there! Thiss log post couldn’t be written much better!
    Going through this article reminds me of my previous roommate!He constantly kept preaching about this.
    I will send this information too him. Fairly certain he’ll have
    a veery good read. Many thanks for sharing!

  22. So long as you do your research and only buy products that properly filtered
    to take outt them. Anotther method recommends using drying agents rangung from alcohol to hydrocortisone to nail polish removver to white stick deodorant tto hemorrhoid cream to the bubblegum pink medication you take for a souhr stomach.
    Keep in mind that what is good for a big dog is not good ffor a small dog.

  23. Thank you for the auspicious writeup. It in fact used to be a entertainment account it.
    Glance complex to far brought agreeable from you!
    However, how could we keep in touch?

  24. My brother suggested I may like this web site. He
    was once totally right. This post actually made my day.
    You cann’t believe simply how much time I had spent
    for this info! Thanks!

  25. Oh my goodness! Incredible article dude! Thanks, However I am having difficulties with your RSS.
    I don’t understand the reason why I am unable to join it.

    Is there anybody having the same RSS issues? Anyone who knows the answer will you kindly
    respond? Thanx!!

  26. Erin says:

    I’m truly enjoying the design and layout of your site.
    It’s a very easyy on the eyes which makes itt much more enjoyable for me to coe
    here and visit more often. Did you hire out a designer to create your theme?
    Outswtanding work!

  27. Anastasia says:

    Hi to every , for the reason that I am in fact eager of reading this website’s post to be
    updated daily. It contains nice data.

  28. Excellent beat ! I would like to apprentice while
    you amend your site, how could i subscribe for a blog web site?
    The account helped me a acceptable deal. I had been a
    little bit acquainted of this your broadcast offered bright clear concept

  29. After I initially commented I appear to have clicked on the -Notify me when new comments are added- checkbox and from
    now on whenever a comment is added I get four emails with the same comment.

    There has to be a means you can remove me from that service?
    Many thanks!

  30. Lawerence says:

    If you are going for best contents like me, simply go to see this web page all tthe time because it provides feature contents, thanks

  31. Zachery says:

    Hi, yeah this post is genuinely pleasant and I hace learned lot of thikngs
    from it regarding blogging. thanks.

  32. Hey! Do you use Twitter? I’d like to follow you if that would be okay.
    I’m undoubtedly enjoying your blog and look forward to new posts.

  33. Excellent items from you, man. I’ve keep in mind your stuff prior
    to and you’re simply extremely wonderful. I actually like
    what you have obtained right here, really like what you’re stating and the way in which wherein you assert it.
    You are making it enjoyable and you continue to
    care for to keep it sensible. I can not wait to reaad much more from you.
    This is actually a wonderful website.

  34. Hi there, after reading this remarkable article i am as well happy to share my experience here with friends.

  35. May I simply just say what a relief to find an individual who genuinely knows what they’re talking about over the internet.

    You definitely realize how to brkng an isssue to light and make it important.
    More people must read this and understand thiis side of the story.

    It’s surprising you aren’t more popular because you certainly hae the gift.

  36. I read this post completely concerning the resemblance of newest and
    previous technologies, it’s remarkable article.

  37. Hi there, its pleasant poost regarding media
    print, we all understand media is a impressive
    source of data.

  38. Excellent goods from you, man. I’ve understand your stuff previous to
    and you’re just too fantastic. I actually like what you’ve acquired here, certainly like what you’re saying and the way in which you say
    it. You make it entertaining and you still care for to keep it sensible.
    I can not wait to read much more from you. This is really
    a wonderful website.

  39. If you would like to increase your experience just keep visiting this website and be updated with
    the hottest nerws posted here.

  40. Carmon says:

    Howdy! Thiis post could not be written any better! Reading through thnis pst
    remunds me of my previous roommate! He constantly
    keplt talking about this. I’ll send this post to him. Fairl certain he’s going
    to have a good read. Thanks for sharing!

  41. When someone writes an post he/she keeps the thought of a user
    in his/her mind that how a user can understand it. Therefore that’s why this piece of writing is amazing.
    Thanks!

  42. pet groomer says:

    I truly lkve your website.. Excellent colors & theme.
    Did you make this amazing site yourself? Please reply back as I’m
    looking to create my very own blog and want to learn where youu got
    this from or what the theme is called. Thanks!

  43. This site was… how do I say it? Relevant!! Finally I’ve
    found something wgich heloped me. Thwnks a lot!

  44. I like the valuable info you provide in your articles. I’ll bookmark your blog and check again here regularly.

    I am quite certain I’ll learn plenty of new stuff
    right here! Best of luck for the next!

  45. Frederick says:

    Hey! I just wanted too ask if you ever have any issues with hackers?
    My ast blog (wordpress) was hacked annd I ended up losing many months of
    hard work due to no back up. Do you have aany ethods to prevent hackers?

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out / Change )

Twitter picture

You are commenting using your Twitter account. Log Out / Change )

Facebook photo

You are commenting using your Facebook account. Log Out / Change )

Google+ photo

You are commenting using your Google+ account. Log Out / Change )

Connecting to %s

Follow

Get every new post delivered to your Inbox.

Join 163 other followers

%d bloggers like this: