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'brifter' is f'ing stupid
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15,594 Posts
The only thing I can think of is the front derailleur isn't set up properly. I've never had to plug one into the computer to work on the front derailleur. They have been 100% fine out of the box on every bike I've ever installed one on. You sure you're just not noticing the derailleur move? If it's moving one way to trim it pretty much has to be moving the other way.
 

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'brifter' is f'ing stupid
Joined
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15,594 Posts
I don't know if the Di2 auto trims on the big ring which is what I think the OP was asking. Usually is only required on the small ring with the small cogs.
It normally trims 2 times as you shift from 11 to big cog.

In the big ring, if my memory is working correctly.
 
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