this post was submitted on 15 Jun 2023
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bike wrench
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Do you know how to setup and preload the derailleur to get the proper indexing?
I'm not sure, but since 1 and 2 is fine, could it be indexing? I should've shown in the video that when switching 1-2 you have to apply constant pressure on the lever until it clicks. 2-3 feels like it snaps way earlier than it should, and there is no feedback force from the lever after the 'snap', like it doesn't pull the cable at all.
So I can't see what you posted with the link. My browser blocks tracking embedded in imgur links like this. I don't have any way of knowing what 1, 2, and 3 are in your instance. Better terminology would be inner outer and mid, or big, middle, and small ring. I don't blame you for not knowing the terminology or whatnot. I totally understand what it feels like on the other side of the coin.
Triple derailleurs are almost an art to get them shifting really well. It will likely require using an inline micro barrel adjuster spliced somewhere in the cable housing. On all FD's it is not intuitively obvious, but the height is absolutely critical. The outer cage should clear contacting the teeth of the outer ring by 1-2mm.
It is difficult to get the initial cable tension right for a FD, especially a triple. Explaining it in depth is not very effective here. I recommend watching a reputable youtuber for this if possible. It sounds like you probably do not have the proper tension on the cable for indexing. Some people use 3rd hand tools to preload the cable.