Ooops, sorry. I got my numbers mixed up. 7700 is indeed Octalink. I should know that since BB-7703 is what I use on my road bike. Anyway, back to your question.
Correct, BB-7700 is not sealed. (7703 is)
I have to give the standard answer on chainstay clearance: Try it and report back. Every frame is different.
We also appreciate bike pr0n.
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