I have a problem with my Brompton: the chain tends to come off when I unfold it. Has anyone else ever had this problem, and if so, how did they solve it?
Check the chain tensioner's spring tension to see if it moves freely but with a good amount of tension. If it's sticky it may not be following the chain when the bike is folded.
I borrowed one which did this - but never got to the bottom of it. I suspect that stevew may be right It seemed particularly prone to this if I knocked the pedal back while unfolding it
My own has never done this
It hasn't been doing it recently, but I haven't cycled it all that much. I suspect that either the chainwheel or the derailleur wasn't screwed in very tightly.
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