2,111 Comments

  1. Hi Carlton
    How do I rotate the SW-R671 Di2 2×10/11-speed Remote 2 button shifters

  2. Can I replace my rear derailleur (9070)di2 with the latest type dura ace one I’m trying to fitt 30t cassette and can’t on present system

    1. Yes, but why not opt for the Ultegra RD? That will give you the option of 34t AND save you $.

      1. Wasn’t sure if these were fully compatible had actually thought a bought it .OK thanks for the advice I’m on it ..

  3. Hi , is using SM-BTC1 + BTR2 compatible with R8050 ?
    does using SM-BTC1 eliminate the need for junction B in this case ?

  4. Hi Carlton
    I have a C-dale Synapse with ST-R785 Di2 levers (the first iteration of Shimano’s di2 hydraulic lever)
    i would like to be able to add some TT extensions with the TT Di2 shifters on the ends.
    Can I swap my 3 port junction for a 5 port junction box and add the shifters in?

    thanks
    Nathan

  5. Hi Carlton. I keep getting a dead Di2… I cycle somewhere then leave the bike for a coffee for a bit then when I get back to the bike the gears are dead. I have to unplug the battery to reset. I wondered if this was due to heat – I think it happens when the bike is left on a hot day …. any thoughts would be much appreciated!

    1. a bit more on this – this morning I put my bike in direct sunlight and left it for 30 minutes – gears were working before trying this. Then after 30 minutes the gears were dead. I was thinking this might be the Bluetooth module so removed that, waited for the bike to cool down and the gears to work again and then left the bike in the sun again. Gears dead again.
      I plugged the bike into my laptop and got etube running which showed that the shifters weren’t recognised but everything else was. Have you ever come across a problem like this? Seems to be related to heat and the connections from the and including the junction box to the shifters…
      DI2 – R9170 components throughout. Any thoughts?

      1. Author

        Great troubleshooting! This is very odd. All of the components should work fine at common temperatures. It’s unlikely that both shifters are not working properly at the same time. So it’s more likely a cable or an A-junction. I would get an extra Etube cable and start disconnecting components/cables and connecting them directly with an external cable to isolate the bad component.

      2. I had a problem some months ago, but put it down to cold. I always left my battery go down to flashing red. Used the same charger (Mar 2015) to charge up. Same garage and around the same yearly temperatures. This spring I went out, indicator was flashing green. 30km into a 65km cycle, front derailluer went to small chain ring. Charged up once home. Within two or three weeks, the same thing happened again. I had a new cable cut in half and four 4mm multi meter test sockets inline. I checked the voltage drop each day at around the same time for about two weeks. Each day it dropped around 0.07 Volts. I remember I was ok on the bike on Good Friday, a 130km cycle with a few front derailluer shifts and the drop for that ride was only 0.03 Volts. I also checked each derailluer movement loading and using a Fluke ma grip on clamp meter, got around 9mA per shift. I thought the front derailluer would be more as that is the one that would remove your finger from your hand. I then removed the seat post and got the same results, 0.07Volt drop per day……New battery required. I changed my charger and have no problem since. I always charge now on flashing green. I have always been care full where I park the bike and watch where the buttons are resting….. One final point, I always park up on the small chain ring.Why, just in case the system thinks the voltage is low and wants to change down, I don’t want it happening in my garage and the chain pulling across the chain ring for a few days. I have more info, but traveling at the moment. I can send it on in excel/ Word doc.

  6. Small question , about Full syncro mode , it allows automatic control of FD when i move up or down the cassette , but does it also allows auto. control of RD when i move between crank rings “like in semi-syncro mode”

  7. Hi,
    just bought a frame with Di-2 pre-installed.
    Brand new R8050 mechs now fitted =by me during assembly.

    I have not had an opportunity to view the set up on the Ipad, but I notice that the rear mech is working 11 speeds whilst on the small ring, but only 9 when on the big ring.
    The previous frame owner (semi-pro triathlete) had not set up Synchro (I have tried double/triple clicking the A-Junction)

    Has anyone seen this operation before ??

    1. Morning Stephen

      On my bike it is the other way around, namely, when in the small chainring the RD will not shift onto the two smallest cassette sprockets. According to the Shimano Dealer Manual this is deliberate and part of normal operation, presumably to avoid extreme chain angles. I have not set up syncro or semi syncro shifting but have my system on M (manual mode so I’m using both shifters)

      1. Thanks for the reply. The avoidance of extreme chain angles makes sense, and the risk of the chain jumping onto the big ring without warning.

        I will have a closer look into this on this bike and my other bike which has 6870 fitted (with Synchro).

        I certainly note that my Synchro (rear) works it’s way through the ratios so that there are effectively only 16 gears in use. It does still allow me to force the front mech across.

        1. Hi Stephen I too have 6850 on another bike but that limiting feature was not present – I think it is a new feature to the R8000 series, maybe because the RD cage is brought slightly inboard. The only other difference which may have a bearing is that my 6850 has a short cage whereas my R8050 has a medium cage

  8. Hi Carlton,

    Sorry in advance for this long-winded post but I need some help with my Ultegra Di2 RD 6870. I washed the bike after a particularly dusty ride a few weeks ago and since then my RD has stopped working. Ive tried a whole bunch of things:

    1.) Initially, i thought it was water damage, so i left it to dry in the sun…nope.
    2.) Then i thought maybe i should connect it to e-tube and see whats up: everything (including the gear position unit near the RD) gets recognised, but it cant find the RD.
    3.) I noticed my battery was also dying every 2 days or so, so i took out the battery and put a spare one on. Same result…so its not the battery.
    4.) I turned my attention next to the cables and junction box near the BB…thinking that maybe some water got pooled in the JB terminals and caused a shortage. So i took out my BB and played around with the JB swapping the cables. Again, RD doesnt work but all the JB terminals do.
    5.) RD cable. Next i connected my RD to the cable entering the FD, because the FD works fine. No dice. RD still doesnt work, so its not the cables.
    6.) Crash mode. Here’s one thing i’ve not been able to try. I noticed that when I press the button on my control box SM-EW90 junction, i cant get it to turn on calibration mode (solid red light). However, when i press the buttons on the shifter to check battery level, i can get the green and red lights showing the correct battery status. I havent been able to figure this out…the button on the JB essentially doesnt do anything. I hadnt needed calibration mode before this hiccup so i dont know if the button has always been faulty or it happened because of the wash.
    Even if it entered crash mode, i thought the RD would shift to the easiest gear automatically? Right now its stuck dead 3 gears from the easiest.
    7) Last, i havent been able to check the voltages heading to the derailleur or out of the battery. As soon as I connect the RD, the battery dies within 2 days, otherwise, it stays solid green after charging. Do you think this is the next step to take?

    I dont have a SM-PCE1 tool to directly connect the RD to e-tube, but with a normal e-tube connection via SM-EW90, i can see all the components except the RD…so I know the EW90 is also working fine! Unfortunately, im in a place where there are no LBS’s nearby that can diagnose or look at Di2 components, so im on my own here.

    Help! I didnt expect the RD to be dead after a few mins of water spraying when i’ve ridden through much worse conditions on the road!!

    1. Sorry for the double post.

      I have had this issue and here is my tuppence worth.

      Diagnosis via the PCE1 is the best way to go, almost always, though even that can lead you astray if your battery is not adequately charged.
      For example, if your battery is not adequately charged the PCE1 can simply list that the system will not work without certain components, even if they are all present and correct.

      I recovered from a similar scenario to yours by simply making sure the battery was fully charged before moving forward. I used two batteries and both needed topped up! Yep, silly, but that was it.

      If fully charged batteries fail to resolve the issue, [assuming you are not simply following procedures to exit emergency/crash mode] then you want to PCE1 diagnose your RD [directly] and check all is up to date and error free.

      Enjoy Di2. We love it!

      1. Thanks James. Unfortunately, i’ve also tried that. I’ve charged the batteries for 8-12 hours at a time (more than their recommended 2-4 hrs) because everytime i connect the RD, the battery dies within a day…without the RD, it keeps going without problems. I’ll try it again anyway…thanks.

  9. I have had this issue and here is my tuppence worth.

    Diagnosis via the PCE1 is the best way to go, almost alway, though even that can lead you astray if your is not battery adequately charged.
    For example, if your battery is not adequately charged the PCE1 can simply list that the system will not work without certain components, even if they are all present and correct.

    I recovered from a similar scenario to yours by simply, making sure the battery was fully charged before moving forward. I used two batteries and both needed topped up!

    If fully charged batteries fail to resolve the issue, [assuming you are not simply following procedures to exit emergency mode] then you want to PCE1 diagnose your RD [directly] and check all is up to date and error free.

    Enjoy Di2. We love it!

  10. I have a Dura Ace dI2 and the rear derailleur has stopped working. I recall there was a clicking noise before it stopped. I have replaced the external battery but this hasn’t helped. I have swapped rear and front mech cables and the rear shifter will work the front derailleur. The rear derailleur will automatically shift in protection mode but then will not work with the shifters. Any further ideas would be much appreciated.
    Thanks
    Marcus

    1. Author

      Your best bet is to use the PCE1 computer tool for full diagnostics. Short of that, it seems like you have a failed rear derailleur. So you can either use the PCE1 to do a full diagnostic, or get a new rear derailleur.

      1. Author

        It sounds like you have a failed rear derailleur. If it has the same problems when connected via a different wire (i.e. the front derailleur wire), then you can rule out cables and assume it’s the derailleur that is failed. You can probably confirm via the PCE1, or you can get a new rear derailleur and see if that fixes it.

  11. So to adjust the auto trim on the front derailleur when in the 6th gear you enter adjustment mode on the big\big then move to the small ring and 6th on the rear and make the trim adjustments? Is that how it works as I’m having a slight rub on outer edge of FD.

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