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Originally Posted by
kasperbs
The reason is that I'm making an exact replica of Lance's 1999 Tour de France bike. And he was using a Cinelli Oyster quill stem on his Trek.
If I understand you correctly, then Trek has been selling these frames with two different forks? Otherwise it wouldn't be possible.
Whether Trek sold them as that, or if it was a special team/rider adaptation, I have no idea. Some say threadless forks can be threaded. But two different forks seems like the most probable explanation. The frame doesn't care, it can deal with either easily enough. But for a slick installation, the steerer tubes of the forks, and the (top half of the) headset has to be different.
The external preload-and-seat post clamp fix would work. And would PROBABLY allow you to use a quill stem. But it wouldn't be an exact replica as you'd be using the wrong headset.