Frequently Asked Questions

We have compiled a list of Frequently Asked Questions to answer all your quick and short Di2 questions. Do you think we’re missing a question? Let us know!

The Junction A (SM-EW90 / EW-RS910) manual mention that you can press-and-hold the button on the junction box to enable bluetooth connection mode… and it is not wrong.

It just isn’t completely right either.

What the manual fails to clearly mention is that you also need a Wireless Unit or D-fly, or a System Information Display. Without either of those you will not be able to connect to the bike using your mobile phone or tablet, no matter how hard you try.

Read our Wireless Unit / System Information Display – why get one article to find out more.

Hah, we’re afraid it doesn’t work that way. Di2 stands for Digital Integrated Intelligence. Of course Shimano could add another I to that and call it Digital Integrated Intelligence Improved (Di3)… but it’s more likely that they will just increase the existing model / product codes.

Having said that though, Shimano are rumored to announce and release Dura-Ace 9200 sometime in 2020. We’ll keep an eye on any announcements and post news as soon as we hear anything.

The later generations Di2 have implemented a feature called Gear Position Control – this is used to prevent the user from shifting into the smallest sprockets when in the small ring and thus preventing too slack a chain.

You can read more about this feature on this page we wrote about it.

After you change the remote e-tube passkey chances are the mobile app won’t let you connect to the bike. This is usually caused by your phone having stored the previous passkey.

In order to get around this problem simple go to your phone’s bluetooth device list and “forget” the D-fly / Wireless Unit from your phone. Now you should be able to connect to the bike again and you will be prompted to enter the passkey.

E-Tube is the name Shimano gave to their Di2 electronic communication system. It consists of electric wires, components, plugs and its own communication protocol (using CANBUS).

The e-Tube project software is the Windows desktop application Shimano released. You can use this software to set up your bike, customize settings and run diagnostics.

Shimano also released an iOS mobile/tablet app as well as Android versions. In order to use these mobile apps you’d need a Wireless Unit / D-fly or a System Information Display (XT / XTR).

You will need the Shimano e-tube project software to upgrade firmware. Keep an eye on their firmware update page and whenever they release new firmware for your components simply connect your bike to a windows computer and run the e-tube project to start updating.

Chain rub can happen to the best of us. The fix for this depends on where the rubbing occurs. If the chain rubs in either your lightest or hardest gears, double check the top/low limits for your front derailleur. If the rubbing occurs anywhere else you may have to try micro-adjusting or play around with the rear derailleur settings.

The front derailleur low/top limit settings depend on your Di2 series. We have added guides for both 1-bolt and 2 adjustment bolt front derailleurs to our installation guides.

If the above links do not help you resolve the issue, please send us an email and we’ll try to help the best we can.

You can change synchronized shifting mode while on the bike easily. Just double-press the button on your junction box and you will change to the next shift mode.

The LED that comes on indicates what mode you’re currently in.

Synchronised shift buttons

Do you want to read more on synchronized shifting? Try our Synchronized Shifting explained guide or read how to customize synchronized shifting.

Synchronized Shifting is available to everyone running current or previous generation Di2 with up-to-date firmware and the BT-DN110 battery or BM-DN100 external battery mount installed.

The synchronized-shifting compatible series are:

  • Ultegra 6870
  • Ultegra R8050
  • DURA-ACE R9000
  • DURA-ACE R915

Synchronized Shifting is also available on mountain bikes. In order to use synchronized shifting on a mountain bike you need up-to-date firmware, the BT-DN110 battery or BM-DN100 external battery mount and also a System Information Display (SC-M9050, SC-M9051 or SC-MT800).

The synchronized-shifting compatible mountain series are:

  • XTR M9050
  • Deore XT M8050

We recommend you use Shimano’s TL-EW02 cable plug tool to connect and disconnect your components. They make it so much easier to connect things properly – you should feel and hear a click when connecting your wires.

You probably didn’t get a manual with your bike, but you can find Shimano’s own manual right on their website: https://si.shimano.com. We’ve mirrored the files for you:

Besides hosting the official manuals we’ve also written a Di2 getting started guide with all the information you need as a new Di2 user.

If you’ve forgotten your e-Tube wireless passkey you can reset it by connecting your bike to a computer and running the e-Tube windows application. Read the post on changing your wireless passkey using a Windows computer.

When Shimano introduced Synchronized shifting june 2016 they also changed the behaviour of the Junction A. When you check the Di2 battery level the LEDs on your junction box will first indicate the battery level, turn off and then illuminate again to indicate the selected synchro-shift mode. The different modes are:

  • Red and green LEDs turn on for two seconds – manual shift
  • Red and green blink two times – synchronized shift mode 1
  • Red and green blink three times – synchronized shift mode 2

Has your bike suddenly started doing this, even though you’ve had it for a long time? Your junction A firmware has probably been updated by either you or your local bike shop.

Note that this behavior will always trigger when you check the battery level, even if your bike doesn’t support synchronized shifting.
(provided your firmware is up-to-date)

First things first: make sure your bike has a Wireless Unit (EW-WU110/EW-WU111). It is an optional component and most Di2 bikes do not ship with this unit installed.

In order to enable you to connect to the bike, press the button on your junction box for about two seconds (until the red/green lights start flashing). If this doesn’t happen at all, try updating your firmware. The SM-EW90 junction box (that’s the below-the-stem version) should be on at least 3.0.4. Connect the bike to a windows pc to make sure it is up to date.

If this does not solve your problem, please contact us and we’ll try to help the best we can!

Unfortunately you can’t! Shimano has not made the e-Tube project software available for Apple (Macbook) devices. This can be a real problem to those wanting to update their Di2 firmware. If this is you, we suggest the following workarounds:

  • Take your bike and your SM-BCR2 charger to a friend and hook it up to their Windows laptop/pc
  • Take your bike to a good Local Bike Shop (LBS) and ask them to update your Di2 firmware. They will be glad to help at low or even no cost
  • Install the e-Tube project mobile app (if you have the Wireless Unit) and update firmware that way. Be aware you may need to reset the system.

Yes you can! This is done quite a lot by Di2 users who want to run a 1x setup only (no front derailleur) – on their gravel bikes for example. Have a look at the compability charts – they list which derailleur models are compatible with which shifters.

Your rear derailleur has probably gone into crash mode. This means the motor has disengaged from the cage, blocking any further shifting. In order to restore normal operation, first make sure your rear derailleur and derailleur hanger are not damaged. Then get on your bike and press and hold the button on your junction box for 5 seconds until a red light flashes.

The rear derailleur will go through all the gears now, so make sure sure you spin the cranks until it’s done. Once it has gone through all the gears you’re done and ready to get back to enjoying your ride.

Yep! You can use the MT800 digital display with BlueTooth instead of a Junction A (internal/external). It has three e-Tube ports, shows the battery level, shifting and suspension modes and gear position.

Have a look at the compatibility chart for more information on mixing road and mountain bike components.

Press and hold any of your shifting buttons for at least half a second. The colour and the amount of flashes of the junction box LED indicates how much charge is left.

Junction A battery indicator lights

Of course the LEDs cannot flash if the battery is completely empty, which is why a more accurate approximation would be:

  • Green for two seconds: more than 75%
  • Green, flashing 5 times: 50% – 75%
  • Red for 2 seconds: 25% – 50%
  • Red, flashing 5 times: less than 25%

Please note that when you have 10% or less charge remaining, the front shifting will cease to function. You’ll be stuck in the chainring you selected.

Depending on your firmware version, it’ll also display flashing lights to indicate the shifting mode you’re in.

A Shimano BT-DN110 battery should last for at least 2000km. When used normally you can expect to get about 2500-3000km of riding out of a single charge, depending on how often you shift.

Make sure you have updated the firmware for each piece of hardware you’re using. Connect your bike to a computer using the SM-BCR2 or SM-PCE1 and update your firmware.

No, you can’t. While most Di2 hardware can be mixed across different series, you cannot use 7970 with any other, newer, Di2 hardware. This is because it uses a different wiring system (4/5-conductor vs 2-conductor e-Tube).

Yes you can! There are some limitations, but you can generally mix hardware across series and even use road/mtb hardware on the same bike. Have a look at our post on compatibility for a more in-depth look at mixing different Di2 hardware series.

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