Originally Posted by treechunk
I would be kinda careful swapping headset bits around, they tend to be just differenet enough in very tiny ways to make things difficult. You can absolutely use the whole lower assembly of a threadless headset on a threaded bike, you just need to get an appropriately matching/threaded upper assembly.
exactly what i have. lowers off a generic aheadset, uppers from a 105 threaded. threaded fork, obviously.
works, but was always a temp solution. will be switched out for campy threaded headset soon's i have some $$$