Originally Posted by Sheldon Brown
Frames don't care if the headset is threaded or threadless, that's just a concern for the fork and stem.
Sheldon "http://sheldonbrown.com/headsets.html" Brown
all I was trying to say is that it would be a lot more difficult to find a 1 1/8 threaded fork for a track style bike unless you wanted to use a mtb fork...or maybe there is something that exists that i am unaware of