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HardwareMTBRoad

Synchro shift – how does it work?

How does synchro shift work?

When Shimano introduced the Dura-Ace R9150 series in 2016 they also released Synchro Shift. Then, a few months later, they made Synchronised Shifting available for Ultegra 6800 and Dura-Ace 9000 users. All you need is up-to-date firmware and the current generation battery, the BT-DN110.

Synchronized Shifting requirements

Synchronized shift is available to users running current or previous generation Ultegra or DURA-ACE Di2 and a current generation battery. This means you need one of the following series Di2 to run synchro-shift:

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

You will also need the BT-DN110 battery or BM-DN100 external battery mount.

Of course synchronized shifting is also available on mountain bikes. The same battery requirements apply, but you’ll also need one of SC-M9050, SC-M9051 or SC-MT800 in order to use synchronized shift.

What is Synchro Shift?

According to Shimano; “Synchronized Shift is a function that automatically shifts the front derailleur when the rear derailleur is shifted, allowing the derailleurs to work together efficiently.” This means that you would never manually have to shift the front derailleur anymore. The system will do it for you when it thinks the time is right.

Shift modes

These are the shift modes you can set up:

  • Full Synchro Shift: your front derailleur will shift by itself, when it has to
  • Semi Synchro Shift: when you shift the front derailleur, the rear derailleur will also shift in order to compensate
  • No Synchro Shift / turned off: No automatic shifts will happen. Full manual mode.
Shifting from 11T to 28T
When shifting from 11T towards 28T the system will automatically shift from the big ring to the small ring between 25T and 21T

How to set up Synchro Shift

First you’ll need to download the e-Tube Project software. Connect your bike to your computer using either the SM-BCR2 (charger) or the SM-PCE1 (linkage device/diagnostic tool) and start the e-Tube software. You can now customise the shifting settings using these steps:

  • Select your bicycle type
  • Do the connection check
  • Click ‘Customize’
  • Click ‘Shift mode settings’

e-Tube project shift mode setting
On this screen you can select the number of teeth on your front chain ring, select the range on your cassette, set gear position control, shift interval and the shift modes.

When riding your bike you can use three different shift modes. Shift mode 1, shift mode 2 and full manual. These shift mode 1 and shift mode 2 are set up as (full) synchro and ‘semi-synchro’ by default. However, you can set them up however you like. You could for example set both shift modes to full synchro, but have the automatic shift points differ for each mode. We’ll talk you through customising the different shift modes in another post.

Change shifting modes on the bike

So you’ve got two custom and one full manual shift modes available – how do you use them? That’s easy! Just double press the button on either your Frame/Bar-end junction box or the below-the-stem junction box and you’ll change modes. This is what each light means:

  • Solid red light: manual shift mode
  • Twice blinking red light: shift mode 1 (default: synchronised shift)
  • Three-times blinking red light: shift mode 2 (default: semi-synchronised shift)

Synchronised shift buttons Looking for even more information on Synchro Shift? Check out our other posts or the Shimano e-Tube website.