How do I enable or change Synchronized Shift mode?

You can change synchronized shifting mode while on the bike easily. Just double-press the button on your rear derailleur (12-speed Di2) or junction box (11-speed Di2), and that will change the bike to the next shift mode.

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

11-speed Di2 synchro shift LEDs

• Solid red/green lights: manual shift mode
• Twice blinking red/green lights: shift mode 1 (default: semi-synchronized shift)
• Three-times blinking red/green lights: shift mode 2 (default: synchronized shift)

12-speed Di2 synchro shift LEDs

• Blue (2 seconds): Manual shift
• Flashing blue (2 times): Shift mode 1
• Flashing blue (3 times): Shift mode 2

Do you want to read more on synchronized shifting? Try my Complete guide on Synchronized Shift.