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1mm size difference?

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Old 09-16-18, 12:25 AM
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hobodeluxe
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1mm size difference?


Hi, I found a Cinelli 3ttt quill stem in good shape (with a Pista handlebar) to upgrade the heavy one on an old Custom Sport Nishiki I use both as a commuter and bike repair leaning project. The new quill stem seems to be too big for the steerer tube (and the lock ring, or however itís called) by just 1 mm. I first (gently) hammered it in after greasing it thinking it was just tight, but the lockring got stuck and it wasnít easy to get out. The end piece that goes at the end of the stem screw is also different. I looked in Sheldon Brown list of stem sizes but did not find one thatís 1 mm larger or smaller than other. They are all 22.2mm, but the Cinelli seems to be like 22.25. Is this just a miniscule difference between manufacturers? Should I get a different lock piece for the quill and hammer it in again anyway?

Thank you
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Old 09-16-18, 01:10 AM
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tonyfourdogs
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Please don't use a hammer!

There are way more experienced folks on this board, many of whom will likely chip in, but in my limited experience, quill stems are very easy to slide in and out of the head tube because of the way they're designed. That includes the lock piece.

Have you measured the original quill? I'd guess that it's a smaller size (e.g. 22mm) which is why the 22.2 won't fit.
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Old 09-16-18, 06:14 PM
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Don't hammer. My guess is that the lock nut was pulled up into the quill w/o being in a head tube which over expanded the quill split section out of shape and can simply be pushed back in shape in a vise. I have and have had many Cinelli's and they all were 22.2mm and if they ever made another size I think it would be 21.15mm for older American frames or 22mm for older French frames. You bike is Japanese so would be 7/8" and take a 22.2mm quill and would have lugs so it is hard to imagine the head tube being distorted but that is possible I suppose. If your quill body is the problem not the split part that expands when you bring the nut up tight the difference you are measuring is only 0.002" which you should be easily able to emory paper off the aluminum. Work slowly and check often until it slides in. I know guys would do this to fit a 22.2mm quill to a french frame rather than $$$ for a rare 22mm french quill.
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Old 09-16-18, 08:18 PM
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thanks! after reading the comments it became obvious to me how the locking system of the Cinelli quill works, how dumb of me I didnt figure it out. Itís has to be the split part thatís bent cause the lock nut got stuck but it wiggled sideways, as if one of the parts wasnít perfectly rounded. Iíll give it a try tonight.
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