Because of a disability I want to control Di2 Ultegra (3x11) with a single XTR Firebolt shifter on a flatbar racer. All shifters are plug and play (which is fantastic) so no problem with compatibility.

Of course, synchroshift is only for MTR XTR so I need four independent 'signals' to the control box (which should necessitate two XTR shifters).

But I notice that the XTR shifter can actually send FOUR signals to the control box. You can push each paddle a short way (one click) or all the way (two clicks). On another bike with Alfine Di2 I use this to change one gear (one click) or two gears (two gears).

Now apply to Ultegra Di2. I wonder, could I use one-click on the first paddle to control the rear derailleur (down) and two clicks to control the front derailleur (down)? Likewise (up) using the other paddle.

Would take a little time to learn but I'm prepared for that. My question is whether I can use the one-click and two-clicks as entirely different instructions. If so then I'm sorted.

Jeff

Doubt it.

Call Shimano. They can assist you. They have many adaptations they have made for disabilities. Wayne Stetina, their VP of road bike products, is big into Ride to Recovery.