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seat tube top missing, is this frame salvageable?

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seat tube top missing, is this frame salvageable?

Old 11-02-10, 05:49 PM
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seat tube top missing, is this frame salvageable?

This giant frame is missing the upper part of the seat tube where a clamp would secure the seat post. I have no idea how this happened. It was given to me to rehabilitate. Is this frame salvageable? I"m at a lost.

Here is a picture.CIMG5451(web).jpg
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Old 11-02-10, 06:10 PM
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ouch. There might be no good solution to this problem. There could be bad solutions though. You could epoxy the post in there, for example.

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Old 11-02-10, 06:14 PM
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epoxy, definately a last resort measure.
Any other ideas?

I wonder how did this even happen?
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Old 11-02-10, 06:19 PM
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looks to me like the seat post got stuck in there and the person who took it out used a hacksaw

do you know what size the seat post is? You could conceivably put an internal sleeve and use a smaller seat post
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Old 11-02-10, 06:22 PM
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Take it to a welder or framebuilder. Have them put a steel tube in it, weld/braze it. Hopefully they will have a seat collar that they could braze on it. Then put a smaller diameter seatpost to match the steel insert. Could be more expense than the whole bike itself.

or

Get a steel seatpost that is compatible with the diameter of your seat tube and then have the welder/framebuilder weld/braze that sucker permanently on there. Just make sure the seatpost height is right before that happens. This could be a whole lot cheaper alternative.
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Old 11-02-10, 06:24 PM
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so it already wont move?, If it will still go up and down, you could make a wedge on the end of the seatpost
like a stem would have..
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Old 11-02-10, 06:25 PM
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Right now the seat post is loose, just spins around.
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Old 11-02-10, 06:28 PM
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+1 Quill seat post. Buying one will be cost prohibitive. Make one yourself and it will not. Do a search, various forum members have made versions of quill seat posts before.
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Old 11-03-10, 02:16 AM
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Originally Posted by paulzinho
This giant frame is missing the upper part of the seat tube where a clamp would secure the seat post. I have no idea how this happened. It was given to me to rehabilitate. Is this frame salvageable?
I rehabbed a bike where someone had pulled the seat post way up, and then sat on it, which snapped the seat tube off pretty much like that. As luck would have it, when I got the bike the I got the seat post too, with the remains of the seat tube still attached. It took some fiddling but eventually I got the surfaces to mate up well enough for me to be able to weld them back together.
Yours have a bit of the same flare as mine had, but I also think I see tool marks, which might imply another story.
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Old 11-03-10, 08:38 AM
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That picture makes me sad.
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Old 11-03-10, 09:23 AM
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I see tool marks too. I'm going to look into that seat post wedge. It sounds intersting.

If there is a good thing about this, at least it's only a Hi-ten steel frame and not better quality tubeing. That would have been even more of a shame.
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Old 11-03-10, 10:32 AM
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Here's a bmx tutorial for a quill seatpost: https://bmx.transworld.net/1000076881...dge-seat-post/

I'm sure someone can post a link to more examples.
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Old 11-03-10, 10:47 AM
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excellent,
I was having problems locating it using the search function.
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