Originally Posted by
bingsu
Often, after every use. Live in a small apartment.
If worse comes to worse and none fit the bill I'm open to a small 20" bike, but that's the max my space can afford.
So it seems that you do not need a folding bike that folds very small ?
In your list of requirements, the point I see that can cause problems is the use of the bike on recreational trails, stretches of gravel and dirt tracks.
You should first look at the maximum tire width accepted by the frame with mudguards.
For this reason, Helix won't fit (only relatively narrow road or BMX tires, no mudguards).
For offroad use, a bike with full suspension would help I think.
Even if its not 20" wheels, I think that a Birdy will fit your needs: it folds well (not as well as a Bormpton but you probably do not need such an easy and small fold) and is easy to carry folded, it has full suspension, it accepts wide tires including off road tires.