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Twisting a CroMo Stem?
Hi,
I am asking this here as Frame-builders would know how to manipulate metal. I have a Cromo stem (130mm Velocity brand). The clamp part is not level, It dips to one side i.e. It is rotated slightly on the longitudinal axis. (This may be due to a crash as the bars that were on it are also not straight. Also because It is unlikely they got past Velocity's quality control that way.). So I was wondering: is possible to twist it back to normal? For instance, clamp a handlebar, then slip another tube over it to extend the leverage....then force down on one side, up on the other. Or any other methods? My Concerns are these: Would the twist weaken the weld area? or the stem body? Would heating it make a difference? How hot does it need to be? (I would like to conserve the painted finish....) Thanks for reading. |
What you are suggesting is cold setting chromoly alloy steel, which shouldn't be a problem if the extension doesn't have to be twisted very much to get the clamp area back to level, but there are a lot of details that may complicate things. Is it a quill stem for a threaded steerer, or is it threadless? Is the handlebar clamp area part of the stem, e.g. forged as a single piece, or is the handlebar clamp welded or brazed to the forward extension?
How about posting a detailed photo? How many degrees (angular) is the clamp area twisted out of alignment? |
are you putting this on a bike for someone you don't like?
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Originally Posted by unterhausen
(Post 18611623)
are you putting this on a bike for someone you don't like?
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It is a quill stem that is going on my own beater bike. It is welded at either end.
Do I like me? That's a good question....Ha ha...Either way crashing is inconvenient. I would not like to buy a new one because this bike has to be as low cost as possible, and also 1" long stem quills are hard to find. Anyway it is a very slight twist. at the end of a 60cm bar it translates into maybe 1 cm height difference. In the photo, its hard to see. But the bottom is more to the left. |
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Even better than a stem, how a bout a twisted TT?
http://bikeforums.net/attachment.php...hmentid=511860 |
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