I own a 32-footer and have been looking for bikes to bring along to ride on terra firma whenever we'd find ourselves there. I've tried several small-wheeled folders, but didn't like them much. No way I'd offer up scarce space on board for those.
I did finally find a folding bike that would fit and was also an excellent bike:
A wonderful bike, but it had two major drawbacks: it only came in mrs non-fixie's size and it is too nice (and - quite frankly - also too expensive) to keep in a cockpit locker.
So the Bridgestone sits in my living room as a piece of art (
) and I've still no bike for my boat (
).