Originally Posted by pinholecam

The thing about the Dahon/Tern fold bikes is that they are pretty utilitarian (in a good sense).
They have a wide range of add ons to choose from (ie. racks, mounts, accessories) , work fine.
The 406" wheels on most of them are a good middle ground wrt size of fold, speed and tire options.
They even roll well folded once one ties it up with a velcro strap.

The 16" vs 18" vs 406 vs 451 is always this conflict between fold size and a bit more speed.
IMO, 18" is the better compromise between 16" and 20" for fold size, a bit more comfort with wider tires and speed.

So its still back to what you ultimately value/need for a new bike.
Best fold size (ie. 16" Brompton or 14" Crius Smart 3.0)
In-between (18" Bridy or Tyrell IVE)
Better speed (406/451 wheel folder)


Whats the reason that you prefer the IGH?
I have a Crius Smart 3.0 (3 spd Shimano IGH) and there certainly is a bit more drag on it than a deraileur system.
As you probably know too, over here in South East Asia, IGH are not popular at all and support will be poor/none.
It will be hard to get hold of a 8sp IGH here and they will have to be built up (no off the shelf IGH whee).
You can try Taobao though where I've seen wheels with IGH setups.