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Lateral play in quill stem

Old 06-26-22, 12:33 PM
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Nosnibor
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Lateral play in quill stem

Play in cinelli 1R quill stem. The 1" steerer measures 22.2mm ID as expected but the stem OD is 21.8mm which results in quite a bit of noticeable play when riding! Measured using digital calipers.

I'm confused as the cinelli stem is pretty common, surely they would have a better fit in a standard steerer?

Due to being a newbie, I can't post pictures yet unfortunately
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Old 06-26-22, 12:57 PM
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Check the top headset nut ID - it should be a snug fit on the stem.
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Old 06-26-22, 01:42 PM
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IIRC at one time Cinelli made both Eng/Rtl diameter and French diameter stems. A French one would measure out as about 21.8 to 21.9mm. Andy
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Old 06-26-22, 02:21 PM
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Originally Posted by Andrew R Stewart View Post
IIRC at one time Cinelli made both Eng/Rtl diameter and French diameter stems. A French one would measure out as about 21.8 to 21.9mm. Andy
I've just done some research into this and yes the French (22mm) stems had a little dimple on the quill to denote the French fit. Mine has this so problem solved. Thanks!

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Old 06-26-22, 03:14 PM
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Originally Posted by Reynolds View Post
Check the top headset nut ID - it should be a snug fit on the stem.
Not by any instruction I know of. The nut needs a tad of clearance on the stem. Slightly more then the steerer has.

I just measured 4 Eng top nuts at between 22.31 to 22.55mm and the 3 steerers I have on hand at between 21.98 to 21.13mm.

One aspect of the Cinelli type cone expander stem design is that the stem is held by a very small amount of the quill, the very bottom where it is expanded out. The angled wedge typs (that most Asian stems use) provides far more contact and much higher up the quill too. Andy
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Old 06-26-22, 03:34 PM
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Originally Posted by Andrew R Stewart View Post
Not by any instruction I know of. The nut needs a tad of clearance on the stem. Slightly more then the steerer has.

I just measured 4 Eng top nuts at between 22.31 to 22.55mm and the 3 steerers I have on hand at between 21.98 to 21.13mm.

One aspect of the Cinelli type cone expander stem design is that the stem is held by a very small amount of the quill, the very bottom where it is expanded out. The angled wedge typs (that most Asian stems use) provides far more contact and much higher up the quill too. Andy
I had a similar problem once - with the bolt tightened the handlebar/stem could move a bit sideways and creaked. Found that the top nut had some play on the stem, replaced it with one that slided on the stem by hand but with almost no play, problem solved. I don't understand why the nut ID should be bigger than the steerer's.
BTW, your steerers measured way smaller than the nominal 22.2?
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Old 06-26-22, 03:49 PM
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Originally Posted by Reynolds View Post
I had a similar problem once - with the bolt tightened the handlebar/stem could move a bit sideways and creaked. Found that the top nut had some play on the stem, replaced it with one that slided on the stem by hand but with almost no play, problem solved. I don't understand why the nut ID should be bigger than the steerer's.
BTW, your steerers measured way smaller than the nominal 22.2?
It is small, but there is always some runout error between the threads and clearance diameter on the stem and on the nut. That alone doesn’t mandate which is larger, but it does imply that one side of the joint should have additional clearance to account for that.
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Old 06-27-22, 03:25 AM
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Originally Posted by Reynolds View Post
Check the top headset nut ID - it should be a snug fit on the stem.

my top nut has a plastic spacer to fill the gap between the stem and nut ID. The nut isn't designed to take the load of the stem.
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Old 06-27-22, 05:11 AM
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I'd say that's a water intrusion seal more than anything else. ^^^^^^
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Old 06-28-22, 11:59 PM
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I used a French Cinelli stem in an old Paramount once upon a time. Had to crank down the wedge/expander bolt pretty, pretty snug to keep it in place.
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