first of all, the dahon helios was a 20" folding bike. the bike you're thinking of was called "presto lite" and had 16" wheels. both are no longer made. (dahon produced an anniversary edition of the presto lite that cost over 1k and is a single speed bike available only in asia as far as i know, unless special ordered) also, the above image shows a dahon curve xl. that bike is also no longer made. the only 16" wheel option made by dahon that would be available in the US is the Curve- a smaller wheel-base version of the curve XL(sl)and also has 305 wheels. the folded size is bigger than the brompton and the nifty magnet latches dahon uses to hold their bikes in the folded position only works if you pick them up in a specific way. would probably be ok for someone 5'5" and less than 150lbs. also, as fietsbob indicated, the chain is on the outside of the folded package on the curve.