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If you are using a BSA bb with internal di2 the bb cups may have threads that are too long - Chris King and Hope bb would not work in my Isen as their threads would block the hole from the bb to the chainstay. - I had to resort to shimano as the threads are shorter.
dancing james-
If you are using a BSA bb with internal di2 the bb cups may have threads that are too long - Chris King and Hope bb would not work in my Isen as their threads would block the hole from the bb to the chainstay. - I had to resort to shimano as the threads are shorter.
Would it be possible to turn down the length of the cap with the threads on it? I know what you mean about the Hope BBs (I don't have any Chris King BBs... yet) but I can't see any real reason why the threaded sections are so long on them.
Brommers
Are you using internal Di2 cable routing and / or internal brake cable routing through the BB? If so it's possibly worth it. Just bear in mind you will be using 30mm spindle cranks from SRAM and whatnot. There's probably a 24mm BB out there for it so you can use Shimano cranks but it's going to be niche and probably spendy IDK.
Personally I'd ask why a normal BSA shell absolutely will not work in your situation. And why they wouldn't 'just' use a PF30 shell which is the widely adopted standard.