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Quill Stem Diameter(5 posts)

Quill Stem DiameterMisJG
Apr 19, 2002 8:13 AM
Ok, I feel really stupid even asking this, but I am looking to replace a quill stem and have been looking through catalogs, etc. I found one I wanted and needed to know what size I would need. The catalog listed 1" and 1 1/8" diameter stems, so I get out the calipers and put them on my existing stem where it disappears into the headset. My stem measured 7/8". What gives? Is this one of those things like tire sizes where there are 500 different ways to measure something and the numbers don't mean anything anymore? Or am I measuring the wrong thing? Like I said, I feel pretty stupid asking this 'cause it seems like this should be a no-brainer. Why can't anything be easy?! Thanks for your help!
road bikes usually require 22.2mm diameter quill's.iSpirito
Apr 19, 2002 8:21 AM
unless its french which is pretty rare nowadyas and needs a 22mm quill.

your 7/8" measurement means its a pretty safe bet for the standard or 1" or 22.2mm quill diameter.

it is all a bit stupid with regard to numbers and such. you can feel safe with ordering a 1" quill and your bike and fork is for a roadbike with threaded headset.

good luck
Yes. Neglected to mention, road, threaded. Thanks! (nm)MisJG
Apr 19, 2002 8:25 AM
re: Quill Stem DiameterNessism
Apr 19, 2002 8:24 AM
The 1" and 1-1/8" dimensions listed relate to the outside diameter of the fork steerer tube. Quill stems are designed to fit INSIDE a 1" steerer tube and thus as you noted they are 22.2 mm or 7/8" in diameter.

So I measured the wrong thing. cool. Thanks! (nm)MisJG
Apr 19, 2002 8:28 AM