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Threadless stem, safety question??(9 posts)

Threadless stem, safety question??Grizfan
Sep 22, 2003 7:09 PM
Wondering if I should be concerned about clamping a threadless stem to a threaded (steel)fork. I wish to raise my bars up from current position & have a threaded fork that would allow me to do so, stem would clamp over threaded section of tube. Any thoughts?? Thanks
not a great idea...C-40
Sep 22, 2003 8:35 PM
Unless you have a small amount of unthreaded steerer above the top of the headset, you have some pretty thin tubing at the root of those threads that can be subjected to a significant force. I assume that you would be putting a fair amount of spacer under the stem? That makes a big difference in the potential leverage applied to the base of the steerer.

It may work fine, as long as you're not a heavy weight who likes to jerk the bars in sprint. If so, forget it.
Agreethe bull
Sep 22, 2003 8:59 PM
Remember with your quill stem the force is mostly in the area below the headset on a treadless it is right above the headset, right about where the steerer as been gouged into with a tap.

The treadless stem also has less surface area to grab and it is also gonna get chewed up from the treaded steerer.

If I was working on a bike and this came out of the woodwork the first thing I would think is..."Who is HACK worked on this?" !!!!
Sep 23, 2003 3:37 AM
I suspected as much! I will turn to my LBS for a safer alternative....
not a great idea...Rob Sal
Sep 23, 2003 9:54 AM
You would be better off using a converter thingie that is made by Cinelli and others in order to use your Ahead stem with a threaded steerer.
Grizfan, this is what you need....russw19
Sep 24, 2003 7:50 AM
Any shop can get one... it's a threadless steerer extender. It clamps on like your normal stem onto your steerer and you clamp your stem to it. They cost around $15 to $20. There are a bunch of brands that make them, but here's a picture of one from Dimension.

But he has a threaded fork. (nm)TFerguson
Sep 24, 2003 11:45 AM
They make the same thing for threaded. (nm)MShaw
Sep 24, 2003 12:10 PM
I got the impression he was switching so he could raise it..russw19
Sep 24, 2003 1:47 PM
But that he had a threadless, but wanted to use a threaded because it had a longer steerer tube. If that is the case, then he can use what I posted about... if not, then all this is pointless, just get a long quill stem.

That's why I posted what I did.