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Narrowing fork tube
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GYXU > Cycling > Narrowing fork tube 22 March 2005 01:43:12

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Narrowing fork tube

Dimitris 19 March 2005 23:33:44
 Hi everyone

I want to lower the bars as far as possible, but it seems that the
stem gets stuck after a point. I removed the fork (threaded 1") and it
seems that the steerer tube get narrower after about 4" (10 cm) from
the top. Is this normal? Is there a tool that would restore the inside
diameter of the tube to what it is supposed to be (22.2 mm) for the
whole length of tube?

Thank you in advance

Dimitris
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Jobst Brandt 20 March 2005 00:35:20 permanent link ]
 Dimitris Stamatelos writes:
I want to lower the bars as far as possible, but it seems that the> stem gets stuck after a point. I removed the fork (threaded 1") and> it seems that the steerer tube get narrower after about 4" (10 cm)> from the top. Is this normal? Is there a tool that would restore the> inside diameter of the tube to what it is supposed to be (22.2 mm)> for the whole length of tube?

Any reasonable steertube has greater wall thickness at the high stress
junction with the fork crown. If this were not so, they would break
easily from the bending loads of road shock and braking. Your steer
tube is just fine, but I suspect you have a short one on a small
frame, so there isn't much depth for a stem.

How much are you missing in your adjustment? There were "drop stems"
(usually for track bicycles) whose reach angled down for such forks.

Jobst.Brandt@stanfo­rdalumni.org
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A Muzi 21 March 2005 02:27:59 permanent link ]
 Dimitris wrote:
Hi everyone>
I want to lower the bars as far as possible, but it seems that the> stem gets stuck after a point. I removed the fork (threaded 1") and it> seems that the steerer tube get narrower after about 4" (10 cm) from> the top. Is this normal? Is there a tool that would restore the inside> diameter of the tube to what it is supposed to be (22.2 mm) for the> whole length of tube?

Quality bikes are built with butted steerers, 22.2mmID at
the top and 21mmID at the bottom. Even not-so-expensive
forks commonly have a brazed sleeve in the bottom 50~70mm of
steerer. (That can be annoying on a small bike if the
builder didn't proportionally trim the column)

There's no snappy solution other than a shorter quill or a
downward-sloping stem

--
Andrew Muzi
www.yellowjersey.or­g
Open every day since 1 April, 1971
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Donald Gillies 22 March 2005 01:43:12 permanent link ]
 dimitris_stamatelos@­yahoo.com (Dimitris) writes:
Hi everyone
I want to lower the bars as far as possible, but it seems that the>stem gets stuck after a point.

you need a track stem, maybe an older cinelli would work well (check
ebay to find one.) A good one will get your bars below the top
locknut of your fork. There is no need to try to manipulate your fork
steering tube.

- Don Gillies
San Diego, CA
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GYXU > Cycling > Narrowing fork tube 22 March 2005 01:43:12

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