Old 03-15-18, 04:46 PM
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Bikes: 1966 Dawes Double Blue, 1976 Raleigh Gran Sport, 1975 Raleigh Sprite 27, 1980 Univega Viva Sport, 1971 Gitane Tour de France, 1984 Lotus Classique, 1976 Motobecane Grand Record

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Originally Posted by Salamandrine View Post

Also, FWIW, I was always taught that rolled threads are stronger than cut threads. Steer tube threads in a factory are rolled on a lathe. Rolling dies don't remove any material. Cutting dies like the Park do. I'm not an engineer. If any of you have any comments on that I'd love to hear them. Just thought it was worth a mention.
I have heard that stem fork-column threads are rolled, not cut. In fact, I just got an email from Andrew Muzi saying the same thing (I had emailed him to ask if their shop would thread a threadless fork for me, since they seem to do a lot of frame repairs.)

Maybe he's right. But if

A) some steerer threads are rolled (those that originate at the factory), and

B) others are cut (threads that are cut with the Park fork die and guide, for example), and

C) the OD of the unthreaded tubing is the same in either case, it would then seem to follow that

D) threaded sections have got to be different diameters, yes?

But if D is true, how come all threaded headsets of a given size (1", say, or 1 1/8") fits any threaded steerer of the same size designation? Wouldn't there have to be two versions--a rolled-thread version and a slightly smaller cut-thread version?

That makes no sense to me. I'm prepared to believe that all threads are rolled, or all threads are cut, but not that some are cut and some are rolled.

Does anyone have an explanation for this?

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--Ogden Nash

Last edited by jonwvara; 03-15-18 at 04:51 PM.
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