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Adjustable Stem Size

Old 10-12-12, 10:42 PM
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Fangowolf
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Adjustable Stem Size

I am going to switch out my quill stem for an adjustable quill stem. It looks like I have to make sure of the type of stem, the stem diameter, and the bar clamp for the handle bars.

I think I have a threaded (no spacers, cap over a lock nut and the quill with wedge in the tube)
The diameter of the current stem is 1"
The handlebar diameter is 1 inch

So I should get a 1" (25.4mm) adjustable quill with a 1" (25.4mm) bar clamp?
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Old 10-12-12, 11:00 PM
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Are you absolutely sure?
a 1" quill means it is a 1.125" fork steerer. 28.6mm
the headset will use a 36mm wrench,,
If it is a 1" headset , that is the steerer tube OD.
the Quill is fitting the ID, and that is 7/8" aka 22.2, metric equivalent.
the wrench usually used is then a 32mm
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Old 10-12-12, 11:11 PM
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Yea I'm not sure that's why I am asking. It would be easier if you could just measure your current part and that are the measurements to look for, sigh. all I know for sure is the current quill stem is 1" in diameter, when I remove the quill stem the receiving tube hole is 1" and the handlebars are 1" in diameter. I'm not sure how the listings of stem sizes relates to those measurements.
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Old 10-12-12, 11:17 PM
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If it is in fact a 1 1/8" threaded fork , think about a quill to threadless adapter,
then you will be able to buy a stem to go on the adapter,
from the more abundant threadless stem sector.
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Old 10-12-12, 11:42 PM
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So it looks like the "size" of a stem is actually 1/8" bigger than the actual diameter of the stem. Maybe the tube is 1/16" thick? So if your stem is 1" you need a 1 1/8" adjustable quill stem with bar clamp to fit your handle bar size.
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Old 10-13-12, 12:28 AM
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headset is dimensioned for the outside, quill stem slips into the inside

tube wall thickness, is 1.6mm , in both cases.. half of an 8th is a 16th.

pick up a decent caliper, PRC makes decent measuring machinist tools too.
digital LCD ones have a button .. Inch/MM..

Last edited by fietsbob; 10-13-12 at 12:34 AM.
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