ARider2

I have a 2020 Cannondale Synapse with an Ultegra FD-R8000 front derailleur. The trim function works when on the small chain ring (low) but it does not seem to have a trim function when shifted on to the large chain ring (high). If I am in the high position (large chain ring) and give the lever a slight push to downshift I get a click, but the derailleur does not move (I expect this should provide a trim adjustment). If I give the lever a good push it will downshift directly to the small chain ring, but I cannot seem to get a trim adjustment when in the high position (large chain ring). I get the click but the derailleur does not move to a trim position.

I also have a 2013 Synapse with and Ultegra front derailleur which has a trim function in both the low and high positons.

I am wondering if the 2020 front derailleur is not set up properly or if this is normal function. Should a late model Ultegra FD-R8000 front derailleur have a trim position in both low and high positions similar to earlier models?

Thanks in advance,

Jeff

datlas 

I am not positive, but I am thinking you need to let your FD outer limit screw allow the FD cage to go out a smidge more.

ingo

Like you describe the trim function on the big chainring should work. This is probably a setup/adjustment fix. Make sure the two marks on the front derailleur adjustment are lined up according to the setup instructions. I would guess they are not, and the derailleur is hard against the outer limit stop when you are in the big chainring leaving no cable slack to move when you try to trim.

shelbyfv

In addition to all above, IME the trim for the big ring is fairly subtle. I'd suggest shifting to big/big, listen for rubbing and see if it changes when you shift to the trim. I'd check this before you mess with anything else.

ARider2

All good suggestions so far. I will try them out and post results.