fold-in-half frames and seatpost removal
I recently discovered that my Downtube can be folded significantly smaller by removing the seatpost and inserting it between the wheels, parallel to the length of the frame.
That the seatpost runs perpendicular to the folded bike's longest dimension seems to be a common flaw among all fold-in-half frame designs. For example, I've attached a picture of the Dahon Curve along with a picture illustrating what it would look like if you removed the seatpost and wedged it parallel to the rest of the bike. The resulting shape is significantly smaller, perhaps even smaller than the Brompton (comparison pic also attached).
The only drawbacks seem to be that:
1. You have to remove the seatpost. (However, I find that, in practice, this isn't any more trouble than lowering the seatpost. You just don't get the same satisfaction of not having to detach anything. )
2. You can't actually stand the bike up this way; At least not Dahons, Downtubes don't depend on the seatpost to stand while folded. (Although it might be possible to stand the bike upright on a nice big rear rack.)
Other than that I think it's a great way to reduce the size of fold-in-half-frame bikes.
Last edited by makeinu; 07-23-07 at 07:02 PM.