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Can I use a threadless HDset/stem w/ a long threaded fork?(6 posts)

Can I use a threadless HDset/stem w/ a long threaded fork?853
Feb 7, 2002 8:50 AM
Well I'm putting together a commuter bike/training bike and
want to spend a minimum amount of money, using parts I already have - hence I have a 1"threaded fork,threadless headset,threadless stem. Could I just clamp the stem onto the fork? or is my only option to get a threaded headset and
a adapter to clamp my stem on? And how reliable are these adapters(for sprinting).
not unless...C-40
Feb 7, 2002 6:19 PM
the threaded fork is long enough so that most (preferably all) of the stem clamp is in contact with the unthreaded portion of the steering tube.

Otherwise, the threaded headset and threadless adapter would be an good alternative. There shouldn't be any problem using one of these adapters.

Quill stems can also be bought real cheap these days. Many stores have them on clearance. Used ones can be had for next to nothing.
Feb 8, 2002 1:46 AM
Simply assemble as if the steerer were unthreaded. You will find most threadless steme use a collar or sleeve to space up to 1 1/8" and this will avoid damage to your stem.
Feb 8, 2002 7:41 AM
That's what I was thinking, My stem is actually a 1 1/8" but has a spacer to fit 1" so the stem would not get hurt and I'm not worried about the fork. So clamping on the threads will be OK?
Sort of....grzy
Feb 8, 2002 10:35 AM
Sure the treads will dig into whatever gets clamped to them and you'll be dealing with a smaller effective diameter. However, a larger consideration is that the threads reduce the amount of material in the steerer in and area that is stressed. You now run the chance of the steerer failing in the area between the bottom of the stem and the top of the headset - where the applied moment is a local maximum. This is just a fancy way of saying you run a good chance of having an unplanned visit to the ER. A normal quill setup is not a problem since the quill extends well past this area. A buddy of mine had a wreck and still managed to fail the threaded steerer w/quill stem right at the HS whihc just confirms that this is a weak link.

Think about what you're saving and if it's worth it to you.
Yup!Spoke Wrench
Feb 10, 2002 2:50 PM
Grze Mnky's right! The stem manufacturers say that if you try to clamp onto a threaded steer tube it will snap off when you hit your first big bump.

My question is: Where did you find a threaded fork with a steer tube long enough to clamp a threadless stem onto?