3 folders, 2 recumbents (1 is electric), 1 recumbent trike, 1 touring, 1 mountain, 1 road bike -- So many bicycles, so little time.
Have you tried the A.H.S. folding handlebars?
I just came across a folding handlebar that comes in straight or trekking style. They fold back like wings flat against the bike frame when you want to make the bike narrow, for bikes that don't flop the handlebar down alongside the wheels to fold up.
there are several variations on the folding bars concept floating around. the "humbert humbert"* shown in a previous post seems to be the least interesting or elegant of the designs i've seen. here are a few others:
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