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tbs-
I haven't seen those spacers so can't say for sure but I imagine they fill the space out rather than concentrating all of the forces through a small point. People brake bigger parts. Given the thickness the bb has to be to allow the nut to fit onto the dropout it probably wouldn't be up to it. I mean, I suppose you could get away with slower/smooth rides. I wouldn't want to ride through London potholes on a regular basis like that...
psg1ben
Sounds sketchy, if the bb cracks your front wheel might end up locking up/jamming into the adapter.