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Re:

25.4mm quill is 1 inch but it fits a 1 1/8" headset.

22.2mm quill is less than 1 inch, but is for 1 inch headset.

28.6mm quill is 1 1/8" but is to fit 1 1/4" headset.

They have to be smaller otherwise they wouldn't fit into the steerer tube.

Sorry if I'm teaching you to suck eggs...
 
Re:

They're mostly 22.2 or .874 inches, so yes, they are 1".

Thanks Mark, but i'm still flummoxed lol. Well explained.
I do have 1 1/18 stems but they're all AHeadset..I think.
 
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