Join Date: Nov 2006
Location: NJ, NYC, LI
Bikes: 1940s Fothergill, 1959 Allegro Special, 1963? Claud Butler Olympic Sprint, Lambert 'Clubman', 1974 Fuji "the Ace", 1976 Holdsworth 650b conversion rando bike, 1983 Trek 720 tourer, 1984 Counterpoint Opus II, 1993 Basso Gap, 2010 Downtube 8h, and...
Folding stems are really hard to find. In most cases you have to buy a bike to get one. It should be just a folding stem, not with the handlebar built in, so you can set it up to fold right or left, front or back.
Long seat posts are very hard to find. You'd want to stock two or three different sizes.
With rim availability, the issue is usually the spoke count. 36h rims are not too hard to find, but 28h can be a real challenge.