Old thread and I would think the TS has already gotten his/her bike.

Anyway, to clarify on this misconception that the Dahon/Tern type frame fold bikes can't be pushed after fold.
Fact, is, most of them can and in fact they roll better.

I've used/tried both roller based folding bikes (ie. Brompton and Tyrell IVE ) and Dahon/Tern like folding bikes (Crius, Dahon )
Most of them come with a magnet which when properly adjusted, will keep the folded wheels aligned for pushing.
The problem (does not even happen for 16", 14" folders) is that the magnet may not be strong enough to hold the wheels together and may open up when coming up against resistance during pushing (eg. a bumpier curb for example)
This is easily solved with a velcro strap (or even a dis-used inner tube) to secure the wheels together.


The advantage of this type of rolling is that its using the 20" pneumatic wheels (or 14", 16" ) of the bike, hence it rolls over/down curbs, blindman floor markings, gaps between train and platform, etc with ease.
This is opposed to small roller wheels system on Brompton, Birdy, IVE, which chatter a lot over uneven surfaces and need lifting over curbs and gaps.


The only catch to all this is that not all Dahon/Tern like folders are made equal and there may still be some models out there that fold such that the wheels are never parallel to each other.
So the buyer should seek out this information (online ) or at the store before buying.