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Old 05-04-06, 09:07 AM   #1
blackcannon
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Bike Stem diameters?

Hey Guys,
I understand the two most popular bike stem sizes are 1" & 1 1/8"...Is there any thing smaller? I was wondering becasue I went to put a bike stem on my recently purchased used Cannondale and it the post was thinner...Do you guys think I have a 1"? It was thinner than the other two road bikes I got sitting in my garage...The other two were the same diameter...The stem on there now is a Cinelli that is in pretty rough shape with Coda handlebars...Are the handlebar sizes pretty universal? I'm guessing mine is a 26 cm...What other sizes are available for handlebar diameters? 26.8? Let me know please...thanks
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Old 05-04-06, 09:11 AM   #2
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http://sheldonbrown.com/gloss_st-z.html#stem
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Old 05-04-06, 09:34 AM   #3
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thanks for the link...
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Old 05-04-06, 10:06 AM   #4
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Handlebar clamp diameters are a different thing than stem diameters. And for stems, there are threadless designs (where the stem clamps around the outside of the steerer tube, which is usually 1" or 1.125", sometimes 1.25") and threaded designs, where a quill stem inserts into the steerer tube (which is usually 7/8" = 22.2mm internal diameter, for a steerer with a 1" = 25.4mm outside diameter).

Back in the day Schwinn ran some slightly narrower quill stems - 21.15mm, because the steerer tube tubing, which had outside diameter of 1" = 25.4mm, had slightly thicker tubing and thus smaller interior diameter. There were also some older Schwinns (Varsity, Continental - the flash-welded models) which had even narrower quill stems.
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Old 05-04-06, 10:11 AM   #5
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Yeah, that's what's weird, though, is there's no old schwinns in this mix. The only other oddball size is the French one, not sure why he'd have that. I kind of assumed that we were talking threaded here, though.
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Old 05-04-06, 01:44 PM   #6
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I prob have the 1" one...the one that timcuperry stated "which is usually 7/8" = 22.2mm internal diameter, for a steerer with a 1" = 25.4mm outside diameter)" I'll check when I get home...thanks again guys....
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Old 05-04-06, 02:10 PM   #7
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Yeah, I was just giving a run-down of the various sizes that are out there. And I've been working on a couple of old Schwinns recently. I assume with your Cannondale that you've got a 1" threaded headset with standard (22.2mm) quill stem. Bar clamp could be 25.4mm or 26.0mm. My guess is that the Cinelli and Coda would both be 26.0.
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Old 05-04-06, 03:31 PM   #8
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Originally Posted by timcupery
Yeah, I was just giving a run-down of the various sizes that are out there. And I've been working on a couple of old Schwinns recently. I assume with your Cannondale that you've got a 1" threaded headset with standard (22.2mm) quill stem. Bar clamp could be 25.4mm or 26.0mm. My guess is that the Cinelli and Coda would both be 26.0.
Just checked...You're right my man...Thanks! Now... what stem from ebay should I get???? hhmmm...
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