Shift signals are sent wirelessly from the shift levers to the rear derailleur. Rim brake bikes can only be set up fully wired. 12-speed Di2 systems support wireless shifting for hydraulic disc brake bikes only. ![]() It's all up to you though, so experiment and figure out what works best for you. This lets that button mirror the one on the rear derailleur, letting you switch synchro shift mode or enter adjustment mode while riding the bike. Personally, I like to set the left hood button to " function". So how do you shift a Di2 bike? How do you change gears with Di2? Simple! Just press the buttons on the side of each brake lever as shown in this image: If you have DURA-ACE or Ultegra 12-speed Di2, you may have found the buttons on top of your shifter hoods, but those usually don't change the gears - you can set them up that way though (scroll down to 'mobile app'). You'll only have to wake up the system once every ride, or after a coffee stop - it goes into standby mode after 30 minutes of inactivity. This first shift effectively wakes up the system. It will not shift the very first time you press a shift button. In this case, you actually have to wake up the Di2 system before it'll work. Most 12-speed Di2 bikes will be hydraulic disc brake systems though, and therefore also use wireless shift levers. The only thing that goes into standby mode is the rear derailleur's BluetoothLE/ANT connectivity. Nope! You don't! There is no "on" or "off" switch.įor wired (or rim brake) Di2 systems, that's all there is to it - the main Di2 system is always on, always ready to shift. Do I need to switch the system on or off? If you'd like to know more about using the Shimano documentation, take a look at my page on using Shimano's documentation site: si.
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