1. Do you know if the brake TT levers ST-R8060-R will work with the bar end shifters SW-R671 please.

    1. Author

      Yes they will work together, but check the Shimano compatibility chart linked in the post above to verify.

      1. Thank you for taking the time to reply.

  2. Hi, I have St-R8050 Shifters, SM EW90-B Di2 Cockpit Junction Box 5-Port, Di2 SM-JC41 Internal Junction Box (4 ports), FD 8050 Front Derailleur, RD 6870 SS Rear Derailleur, Di2 External Battery Mount SM-BMR1-S, Di2 External Battery Mount SM-BMR1-S. and somehow the Shimano E-TUBE doesn’t recognize the battery. It is brand new battery and brand new Battery mount but system can’t recognize them, shows “Unit is not detected”. Any suggestion or recommendation? Thank you so much.

    1. Author

      First, make sure everything has the latest version of firmware. Second, try connecting to just the battery and not everything else, with just 1 wire between the Junction A and the battery.

  3. Hey,

    I’m new to the whole di2 concept and getting lost in a maze of serial numbers online. I’m looking at getting my first triathlon and because where I live is quite hilly I like to have a certain setup with the shifters that I’m not sure is possible. Ideally, I would like 6 shifter buttons, dual buttons on the tt bars to control both the front and rear mech, and then shifters on the breaks to control the rear mech (or the other way round). I know Syncro shift would probably work for what I want but I’d like the ability to be able to drop the front mech when going from fast flat to a steep incline.

    So basically, I think my question is. Is it possible to have 6 different shifters on a tt bike and how what would the setup/junction boxes look like?


    1. Author

      JR, this the standard triathlon/time trial setup. There is no limit to the number of shift buttons. You need a left/right SW-R671 Dura-Ace 2-Button Time Trial/Triathlon Bar End Shifters (or similar), left/right ST-6871 Ultegra Time Trial/Triathlon Dual Control Brake Levers/Shifters (or similar), and a 5-port SM-EW90-B 5-port Front “A” Junction (or similar.)

  4. Hello, i have a bike with an older 6770 kit, that comes with an external battery.. It’s a second hand bike and didn’t come the charger. If i updated junction block a to the latest version that has the pc link and and charge port, would it be possible the use the latest charger to charge this battery? Or do i need to get the external battery charger. Thanks

    1. Author

      Al, you have to use the external battery charger for the external battery. Only the internal battery can be charged via the the newer A junction charging port.

    2. Hi Al, If your interested I have a spare charger for the external battery including a spare battery. Let me know if you are interested. I am living in the Netherlands.

      1. Thanks for the offer Jos, I am in the states so shipping may be a bit much. I’m considering just biting the bullet and updating to the newer battery with the associated hardware.

        1. Thanks for your reaction. One of the nice features of the new internal battery is Synchro-shifting. I am very pleased with it.
          Succes upgrading your bike.

  5. Hello Carlton…Thanks for your thorough and detailed summary. I have a Trek Domane SL road bike with a Shimano Di2 setup. I also have a Garmin Edge 810 computer. The Edge provides the option of displaying the Di2 Battery Life while I’m riding and I’d like to know that although it’s not critical. I’m also interested in the synchronized shifting, especially when I down shift from the big ring to the smaller ring, I’d like the rear derailleur to go up two gears, a fairly common option.

    My questions are: What additional components are needed to enable the Di2 to communicate with my Edge? I believe I will need the DN110 internal battery and the EW-WU101 and EW-WU111 ANT and Bluetooth Wireless Broadcast Modules. Is this correct? What is the difference between the WU1010 and WU111? Do I need both? Any cables? Assuming I installed this, or had it installed, will I need to use the E-Tube Project software to program the shifting?

    Thanks for your help.

    Regards, -Burton

    1. Author

      Burton, you are correct, you will need the DN110 internal battery and either the EW-WU101 or the EW-WU111 Bluetooth/Ant module. The two modules are identical in functionality; the only difference is the shape. You will most likely need on additional eTube wire to place either module inline. (You could install the SM-EWW01 ANT-only Wireless Broadcast Module if you just want Garmin gear selection display but need the new battery for SyncroShift.)

      For SyncroShift, you’ll need a 6870 or newer derailleurs and the DN110 internal battery.

      You’ll need the Windows eTube software to update the firmware after installing the new components, to enable/configure SyncroShift, and to enter gear ratios.

      1. Thanks Carlton. Appreciate the update. Seems like a lot of time, money and effort. For now I’ll pass. Appreciate the education.

  6. Hi Carlton, I have a 6870 series (Groupset) 11 speed Di2 setup that has the external SM-BTR1 battery and SM-EW67 A-E junction. I just upgraded my RD to the XT M8050 to allow a 11-34 cassette. I am told the firmware needs to be updated as evidenced by the new 8050 does not work while plugged in, and the FD now fails to function. I purchased a EW-WU111 to assist me in the firmware updates and other bluetooth functions. I just read the SM-EW67-A-E is not compatible with the EW-WU111. I prefer to not upgrade the battery to a BT DN110. Is there a better was to:
    1. Achieve firmware updates?
    2. Achieve Gear display and battery % on my 510 Garmin via another wireless D-fly system?
    3. Can a SM-EW90 work with the SM-BTR1 battery?


    1. The DN-100 external battery holder has the memory function to work with the EW-WU111 Bluetooth.
      Avoid doing firmware upgrades via Bluetooth. You run a very high risk of bricking the system and will then need the PCE unit to restore any Di2 functionality. Typically a decent bike shop will have one of these.
      Just use the Bluetooth for setting changes, such as Synchro.

    2. Author

      Kevin, you’ll need to update the firmware on everything using the Windows eTube software and PC adapter. The Bluetooth module won’t work until you update all other firmware first. As mentioned, you probably should do future firmware updates via Bluetooth due to higher possibility of failure.

      Yes, the SM-EW90 will work with the SM-BTR1 but it won’t charge it.

      You can achieve Garmin gear selection display via the Bluetooth/Ant+ modules or the Ant module alone. For Bluetooth phone settings support, you will need the DN110 internal battery (or the new external battery) and either the EW-WU101 or the EW-WU111 Bluetooth/Ant module. The two modules are identical in functionality; the only difference is the shape. You will most likely need on additional eTube wire to place either module inline. You could install the SM-EWW01 ANT-only Wireless Broadcast Module if you just want Garmin gear selection display – it does not have Bluetooth and does not require the newer battery.

      1. Thank you Carlton for your advice. I am now looking at installing the SM-BTR2 with the SM-EW90-A to function with the EW-WU111. I will also pickup the SM-BCR2 charger with USB PC adapter to update the firmware to correct the current non-function/compatibility between the FD 6870 and the new XT M8050 RD. Hopefully this plan is sound.
        Thank you again.

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