Originally Posted by
HillRider
Interesting thought. I was under the impression that threadlsss steel steerers had thinner walls then threaded ones since they didn't have to allow for thread depth. However, I just measured a steel steerer cut-off from a Kestrel EMS Pro threadless fork and the ID is indeed 0.875" (22.2 mm) so the wall thickness is the same as a threaded one. I wonder if this is typical.
Yes it's fairly typical, especially for brazed forks, which simply used standard steerers. However many non brazed forks designed from the ground up for threadless used a bulge formed steerer, and these did indeed have thinner walls, and cannot be threaded, or in any case won't fit a quill stem.
As I said in my first post, I suspect the OP's biggest barrier to threading his fork is the remaining depth of the 7/8" ID zone after cutting.