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how do you replace a threaded head stem?(8 posts)

how do you replace a threaded head stem?cali
Nov 9, 2001 12:18 AM
i currently have a 14cm threaded head stem on my road bike and i'm replacing it with a 12cm. How difficult is it to swap? What kind of tools would i need? I have a 1 in head tube.
re: how do you replace a threaded head stem?Akirasho
Nov 9, 2001 4:55 AM
... assuming you're replacing your "threaded head stem" with a like type (generally called a quill stem) then the physical replacement is simple. Loosen the quill wedge by turning the recessed bolt (usually 5mm) at the top of said stem with an Allen key... counterclockwise till it loosens enough to remove the stem from the fork steerer...

The harder part will be removing brake levers/shifters/(usually with an Allen wrench (you'll have to try different sizes) and possibly only on one side (although it might be easier just to take it all off)bar wrap from your handlebar and reinstalling such... unless both quill stems have an "open face" design (your brake cables and housings can remain the same). The pic below gives some examples of open face stems. If you've got open face designs, then you simply remove the bar (with brake levers/shifters/bar wrap/housings and cables)... swap out the stem and reinstall (to the appropriate height, paying attention to your max extension mark).

Note too, that you'll need to align the stem/bar with your front wheel axis and snug things up...

Does this answer your question?

We abide.

Remain In Light.
Here's how:Rusty McNasty
Nov 9, 2001 4:55 AM
Turn the allen bot at the top, until stem slides out. Pull out. Any more questions?
that wont work.vanzutas
Nov 9, 2001 6:11 AM
you have to loosen the bolt a few turns then hit the bolt downward with a mallet or a block of wood and a hammer. this will unset the wedge that is holding the stem in place. The bolt does not hold the stem it is the wedge at the bottom of the stem that does. I have never gotten one out with out hitting the bolt.

Adam
I've never needed a hammerRusty McNasty
Nov 9, 2001 9:05 AM
Hammers just get newbies into trouble. Develope some muscle, and push-turn-pull it out.
you might need a hammerTheMaxx
Nov 9, 2001 10:29 AM
it depends on how well the stem was greased when it was installed. Just use a rubber mallet. Most of the work is removing the handlebar.
and most stems have a 6mm allen.
Don't forgetStraightblock
Nov 9, 2001 9:31 AM
to grease the inside of the steerer tube, wedge & stem bolt when you reassemble it. Otherwise, sweat, rain, etc running down the stem will corrode & make it difficult to remove after awhile. If you have any trouble getting yours out, check www.sheldonbrown.com for tips on a stubborn stem.
There are two kinds...metonymy3
Nov 10, 2001 9:13 PM
There are actually two kinds of quill stems, one that needs a hammer to be removed, and one that doesn't. The newer ones don't. This kind is illustrated in an above post. The quill has a little "nick" taken out of it at a 45 degree angle, and this tightens with the bolt, usually allen. These can just be unscrewed and pulled out.

The older kind uses a wedge, which works by having the quill slit, and a little cone shaped thing (the wedge) up in it. Look at the picture below. The bolt, once tightened, pulls the wedge un into the quill, forcing the two sides of it apart, and pushing out on the steerer tube on your fork. But once it's loosened, the wedge has been forced up in the quill so much that it won't just fall out (see the 3 side pictures). Once the bolt is raised a little, hitting it with a mallet will push the wedge out and free the fork (2nd and 3rd pictures). This kind of quill often has a 6 sided standard or metric bolt head, but not always.

Good luck.

Chris