Hi,
I’m also looking into using the 44EEOS top cup on a standards 44 ID (ZS) headtube. (On One Carbon 456 frame)
I just found that the insertion depth on the frame allowed for the top cup is 6,5mm, and the versions of the 44EEOS I have found are ~15 and 20mm.
So if there is a 44EEOS for “other” frames that can fit inside the 6.5 that this frame has, it would be perfect.
If there isn’t already a shallow cup, how big of a problem would it be to first cut the cup down to <6.5 before inserting it?
I find it rather unlikely that it will pop out, or?
Also the most stress will be on the bottom part that will be a real 1.5″ set in my case.