The primary problem is with that crummy adapter. On my side, most of my derailleurs are triple. However, I have a double 105 (model No. not avaialable at this point) and it mounts fine onto that crummy adapter. Within triples, I fail to mount Ultegra 6703, but Tiagra R443 fits fine, if this were of any help. When I use my own adapter instead, Ultegra 6703 mounts fine, but does not work well with my chainring set, which is an entirely separate issue.