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School me on stem quill sizes

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School me on stem quill sizes

Old 02-06-11, 06:32 PM
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southpawboston
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School me on stem quill sizes

Okay, 22.2mm is the Japanese/international standard. 22.0mm was the French standard. What else was out there? I have a vintage GB stem that my caliper is measuring at 21.0mm. Was there such a standard? Clamp diameter is 25.4mm.

It also looks like someone used it at some point in a standard 22/22.2 steerer because the split is flared out to ~22mm by the expansion bolt.
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Old 02-06-11, 06:43 PM
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Originally Posted by southpawboston View Post
Okay, 22.2mm is the Japanese/international standard. 22.0mm was the French standard. What else was out there? I have a vintage GB stem that my caliper is measuring at 21.0mm. Was there such a standard? Clamp diameter is 25.4mm.

It also looks like someone used it at some point in a standard 22/22.2 steerer because the split is flared out to ~22mm by the expansion bolt.
sounds like the one used by some Schwinn/Ross/ Nishiki and other Japanese bikes for a brief period .833" works out to approx. 21.15mm. The other place you might see this oddball size is on a BMX stem, though it's sometimes called 13/16" it's not that actual measurement.

Last edited by unworthy1; 02-06-11 at 06:50 PM.
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Old 02-06-11, 07:57 PM
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A GB stem that's 21.15mm?!! Who woulda thunk it?!

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Old 02-06-11, 08:07 PM
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In addition to the 21.1 I believe there is a 21.0 on some 70's Peugeots.
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Old 02-06-11, 08:25 PM
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+1 The 1973 Nishiki Internationals I had were all 0.833 stems.
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Old 02-07-11, 06:03 AM
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The GB brand was commonly used by Schwinn during the 1970s for many road bikes, but usually their logo "GB" (in a circle along the extension) was substituted for the letter "S" for the Schwinn commissioned stems. And Schwinn had adopted that odd steering tube diameter for a while.

I also have a chrome plated Tange 27" replacement fork which was reamed to that diameter, and a French made "AVA" alloy stem in the same diameter which I'd found with that fork. That French stem was NOT later milled down, it was factory cast with that diameter below the top 2 1/2 inches (and the top portion of the quill is 23.0 mm - not the standard 22.0 French size). Much like Taiwanese parts today, French stems were once VERY inexpensive in the US, so they too were bought up by many big US manufacturers for lots of lower level domestic bikes.
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Old 03-20-16, 05:31 AM
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I've always heard .833 referred to as 21.1 older Schwinns, BMX and some early MTBs used that size. I have a nice MTB fork with U-brake mounts that takes a 21.1 stem. Ebay is a good source of stems if you need one.
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Old 03-20-16, 03:16 PM
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Originally Posted by cs1 View Post
I've always heard .833 referred to as 21.1 older Schwinns, BMX and some early MTBs used that size. I have a nice MTB fork with U-brake mounts that takes a 21.1 stem. Ebay is a good source of stems if you need one.
zombie thread resurrection!
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Old 03-20-16, 04:25 PM
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Originally Posted by fender1 View Post
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The Undead bikes are taking over.
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Old 03-20-16, 05:40 PM
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Since it's back I'll chime in. Just found some old stems in my hoard of stuff, including one of those nice "S" branded GB stems. The standard non-metric measurement for those is .833 inch diameter and this one is stamped as such; it is only the equivalent of 21.1 metric.

Rather like those modern guys who refer to seatpost diameters at 27 dot 2 when it is actually a decimal point, not a dot.
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