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Old 05-21-11, 09:10 AM   #1
CabezaShok
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Shortening a quill stem (expander cone type)

Hi im wondering if its possible to shorten/cut a quill stem that uses an expander cone at the bottom. i know its possible with the wedge type quill but im not sure about an expander type....i never saw one in person. Theres a stem on Ebay i really like but the seller only says "you can put your handlebars 15cm above your headset"
He does not mention insertion length: http://cgi.ebay.com/ws/eBayISAPI.dll...T#ht_500wt_922

Cheers!
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Old 05-21-11, 10:45 AM   #2
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If you need a shorter stem, simple.. don't buy that one ..
though it appears a steel tube with an aluminum head.

So you should not need to re machine a cone taper
Like, inside a thick wall aluminum quill stem..

will only be an issue on a fork with a very short fork steerer
then often the bike is for a straight/flat bar and the stem
height is welcome.

Pink on the head?

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Old 05-21-11, 10:52 AM   #3
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Shortening a steel stem with a cone expander is very simple. In fact it's easier than with a wedge type because there's no need to match an angle.

The only limitation is the thread length of the expander bolt.

However like the prior poster, your best bet is not to buy something with the intention of modifying it, There are many stems available and you should keep looking until you find that's fine as it is.
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Old 05-21-11, 03:48 PM   #4
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I would disagree that shortening a cone is easier than a wedge. The recess on my Schwinn cone types have the inside reamed out at a taper. So you have to cut to length, ream, and cut the 2 relief slits on either side of stem. Whereas all you have to do with a wedge is to match the angle and make the cut and clean up with a file.

But the previous posters are correct. Buy something the right length to begin with. You will loose about 2 1/2 to 3" off of the length for minimum insertion, so you can subtract that length from the stems you are looking at.

Tom
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Old 05-21-11, 03:54 PM   #5
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Originally Posted by Anthropy View Post
I would disagree that shortening a cone is easier than a wedge. The recess on my Schwinn cone types have the inside reamed out at a taper.
Your conic wedge stems are probably aluminum. My post referenced a steel stem, which is what the OP has (steel column with alloy head). Steel stems don't have a conical inside, you only need to deburr the cut.
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Old 05-21-11, 04:43 PM   #6
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Awesome advice...thanks!
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Old 05-21-11, 06:49 PM   #7
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Yes, they are both aluminum. Nice info to have regarding the wedge steel. Thanks,


Tom
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Old 05-21-11, 07:53 PM   #8
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Your conic wedge stems are probably aluminum. My post referenced a steel stem, which is what the OP has (steel column with alloy head). Steel stems don't have a conical inside, you only need to deburr the cut.
Wouldn't you still need a slit up each side? Steel or aluminum, I've never seen one without slits cut up each side to allow expansion.
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