Originally Posted by
Jeff Wills
Aside from other differences, I think a rolled thread would leave the threads slightly proud of the rest of the steerer tube. (Measure the diameter of a spoke on the shaft and at the threads to see what I mean.) That would require a slightly different inside diameter of the upper cup for the headset to fit.
All the threaded fork steerers I've worked on have had cut threads, and, BITD, we would cut a few more threads on a replacement fork if we didn't have one that fit.
That's what I remember as well.
Was it Ten Speed Drive that started prepping their frames in the US prior to shipment to dealers? Before they started doing that I remember you always had to face and chase the bearing surfaces, and sometimes cut the steerers to length. They'd also do an alignment on a flat table.
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