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21.15mm Schwinn Quill Stem?!

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21.15mm Schwinn Quill Stem?!

Old 09-13-09, 10:35 AM
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dbarnblatt@usa.
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21.15mm Schwinn Quill Stem?!

I am helping a friend build up a 1980's Schwinn Voyageur II. It's a Japanese made frame, so I confidently went over to our parts bin (from the few bikes we have rebuilt) and grabbed nice Sakai Custom handlebar as SR stem and tried to fit it... no go.

So, after doing a little research I found out that the fork uses a Schwinn 21.15mm (.833) stem! I thought I only had issues with all the french bikes I have been building up.

I've searched the web but only seem to find BMX style or riser type stems. Are there any good ol' quill style road stems out there, anywhere? Or maybe an adapter? Any leads would be appreciated.
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Old 09-13-09, 10:38 AM
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I got one. Shoot me a pm
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Old 09-13-09, 10:46 AM
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old and new
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That IS what's called a "one inch" stem. 1" is a nominal size, it's also the size of the steerer's I.D. The difference in actual size alows for the insertion of the stem and expansion ( locking of the wedge ) . The most common size quill out there, certainly on those types of road bikes.
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Old 09-13-09, 11:35 AM
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Sunlite manufacturers a Tourist stem in the 21.1 size. If you need it to go taller, that's the ticket to a more comfortable ride on a vintage Schwinn. It solved the problem on my Schwinn Super Sports.
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Old 09-13-09, 12:34 PM
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dbarnblatt@usa.
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Originally Posted by old and new View Post
That IS what's called a "one inch" stem. 1" is a nominal size, it's also the size of the steerer's I.D. The difference in actual size alows for the insertion of the stem and expansion ( locking of the wedge ) . The most common size quill out there, certainly on those types of road bikes.
The 1" quill stem is 22.2mm... which this is not... it is 13/16" according to Sheldon Brown:

https://www.sheldonbrown.com/harris/stems/index.html
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Old 09-13-09, 01:49 PM
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Originally Posted by dbarnblatt@usa. View Post
The 1" quill stem is 22.2mm... which this is not... it is 13/16" according to Sheldon Brown:

https://www.sheldonbrown.com/harris/stems/index.html
Actually, they are both "one inch," as that is the measure of the fork steerer outside diameter. The 21.1 stem obviously mates to a steerer tube that is thicker walled than that for the 22.2 stems. As you might have gathered from Sheldon Brown's site, 21.1 is the old American standard (also adopted by "old school" BMX). Surprisingly, to me at least, the Japanese made road stems in this size back in the 1970s. They come up on eBay from time to time. You might find one there.
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Old 09-13-09, 05:15 PM
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My Japanese made (Panasonic) Schwinn Traveler also uses this size. The one that it came with is an Japanese aluminum alloy road quill by SR. It's pretty clear that they just reduced the diameter down from the 22.0 mm size, since there is a very obvious change in diameter.
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Old 09-13-09, 06:40 PM
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I had a local machine shop turn down a stock 22.2mm Velo-Orange threadless stem adapter to 21.1mm on a lathe to fit the steerer tube of the stock fork on my 1973 Schwinn Super Sport.

Left to right, the OEM .833" stem, the modified Velo-Orange threadless adapter turned down to 21.1mm, and the stock 22.2mm Velo-Orange threadless adapter:



On the bike:

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Old 09-17-09, 02:57 PM
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I just priced the VO stuf and It was like $50 for the adapter and the stem. Add $20 to the machine shop and the stem cost more than I paid for the frame.... YIKES!
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Old 09-18-09, 03:19 AM
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Get the Sunlite. Its ten bucks and it just looks good on a vintage Schwinn!
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Old 09-18-09, 06:02 AM
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I have at least two, maybe three, stems in the 21.15 mm size. One is an ancient (early? 60's) in the spearpoint style -- resembles lugged construction, but it's all aluminum-- labeled "Compe" where you can see it and "MADE IN JAPAN 21.15mm" where you can't. And I have a similar one labeled "jun" or something like that. As for the third one... I think it's more modern, maybe an SR? Anyway, anyone who wants any of these would be well advised to PM.
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Old 05-11-20, 08:55 AM
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how thick is the plating?

It doesn't look like you ground down the plating. Is the plating thicker than the 1/2 mm you took off? I'm thinking about doing the same thing.
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Old 05-11-20, 08:57 AM
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How has it held up over the years?
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Old 05-11-20, 12:11 PM
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This one is boldly stamped COMPE FORGED over the clamp. It's an earlier version with the external bolt hex and without anodizing.

These came in 9cm and 11cm lengths. It was the longest 21.1mm stem I've ever seen, thankfully not too hard to find today.

I believe Windsor and Nishiki spec'd large numbers of these.




Notice that it has a slight pista-style downward angle, even when used on this bike's rather slack 72-degree headtube:

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Old 05-11-20, 03:45 PM
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just a tidbit of trivia: as was already stated the 21.15 or .883" is 13/16 inch
most people don't realize that 22.2mm is 7/8 inch
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Old 05-11-20, 06:59 PM
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thanks for the reply. What is the clamp diameter? I really need some added height so Iím looking for more like 110 mm in height as well as a 26 mm clamp so I donít think there are any vintage stems that will give me that - hence my interest in a modern stem that is taken down (on a lathe) to 21.1 cm.
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