Originally Posted by
exarkuhn15
I have the pre-2013 version, so the one-piece crank/ring. I would prefer it if whatever I swapped to had nice, low gearing, and a metal chain guard that doesn't break like the plastic one does.
I believe that it's a straight swap if you get another Brompton one-piece crank/ring. If you go with an alternative crank -- say shimano -- then you might have to deal with chainline issues and such.