Originally Posted by
coastiescott
Semi-off-topic but I have a threaded fork and want to run a threadless stem also, but it's on a frame I haven't built up yet. therefor I'm wondering if it would be possible to use a 1" threadless headset and just clamp the stem around the section of steerer that has threads cut into it? Seem like this would give a cleaner look than an adapter, would likely mar the threads but I don't mind that (I doubt i'd go back to a quill, and I could always chase the threads out anyway).
I wouldn't recommend it, the tubing is thinner where the threads are cut and many threaded forks also have a groove or slot machined in them at the threads to keep the headset washer from turning or for cable stops that fit over the steerer tube from turning. Either get a new fork or use an adapter if you're set on threadless.