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Change Di2 Synchro Shift mode using Junction A button (6870, 8050, 9070, 9150, XT, XTR)
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This video shows how to cycle through the Di2 Synchronized Shift modes using the button on the SM-EW90 Junction A.

The LEDs will light up differently depending on the selected shift mode.
2 LEDs switch on: manual shift mode
2 LEDs blink twice: Shift mode 1 (default: full-synchro)
2 LEDs blink three times: Shift mode 2 (default: semi-synchro)

Synchronized shifting is available on Ultegra 6870, Ultegra r8050, Dura-ace 9070, Dura-Ace r9150 and also mountain bike XT and XTR. Read more about Synchronized Shifting on Di2Center: https://di2center.com/2019/02/16/synchro-shift-how-does-it-work/ and https://di2center.com/2019/04/05/how-to-customise-synchronized-shift-settings/
Video by Paul Teeter - thanks Paul!
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