School me on stem quill sizes
02-06-11, 06:32 PM
#1
Senior Member
Thread Starter
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.
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.
02-06-11, 06:43 PM
#2
Stop reading my posts!
Join Date: Sep 2004
Posts: 11,945
Mentioned: 73 Post(s)
Tagged: 0 Thread(s)
Quoted: 995 Post(s)
Liked 511 Times
in
419 Posts
Originally Posted by southpawboston
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.
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.
Last edited by unworthy1; 02-06-11 at 06:50 PM.
02-06-11, 07:57 PM
#3
Senior Member
Join Date: Dec 2005
Posts: 15,773
Mentioned: 405 Post(s)
Tagged: 0 Thread(s)
Quoted: 3012 Post(s)
Liked 3,886 Times
in
1,710 Posts
A GB stem that's 21.15mm?!! Who woulda thunk it?!
Neal
Neal
02-06-11, 08:07 PM
#4
Bike Junkie
Join Date: Jun 2005
Location: South of Raleigh, North of New Hill, East of Harris Lake, NC
Posts: 9,593
Bikes: Specialized Tarmac, Specialized Roubaix, Giant OCR-C, Specialized Stumpjumper FSR, Stumpjumper Comp, 88 & 92Nishiki Ariel, 87 Centurion Ironman, 92 Paramount, 84 Nishiki Medalist
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 60 Post(s)
Likes: 0
Liked 20 Times
in
16 Posts
In addition to the 21.1 I believe there is a 21.0 on some 70's Peugeots.
__________________
Roccobike BF Official Thread Terminator
Roccobike BF Official Thread Terminator
02-06-11, 08:25 PM
#5
Thrifty Bill
+1 The 1973 Nishiki Internationals I had were all 0.833 stems.
02-07-11, 06:03 AM
#6
Old Skeptic
Join Date: Jan 2006
Location: New Mexico, USA
Posts: 1,044
Bikes: 19 road bikes & 1 Track bike
Mentioned: 7 Post(s)
Tagged: 0 Thread(s)
Quoted: 5 Post(s)
Likes: 0
Liked 5 Times
in
5 Posts
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.
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.
03-20-16, 05:31 AM
#7
Senior Member
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.
03-20-16, 03:16 PM
#8
Senior Member
Join Date: Jan 2006
Location: Berwyn PA
Posts: 6,193
Bikes: I hate bikes!
Mentioned: 36 Post(s)
Tagged: 0 Thread(s)
Quoted: 337 Post(s)
Liked 310 Times
in
101 Posts
Originally Posted by cs1
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.
03-20-16, 04:25 PM
#9
Senior Member
Originally Posted by fender1
zombie thread resurrection!
03-20-16, 05:40 PM
#10
Bikes are okay, I guess.
Join Date: Jan 2015
Location: Richmond, Virginia
Posts: 8,262
Bikes: Waterford Paramount Touring, Giant CFM-2, Raleigh Sports 3-speeds in M23 & L23, Schwinn Cimarron oddball build, Marin Palisades Trail dropbar conversion, Nishiki Cresta GT
Mentioned: 60 Post(s)
Tagged: 0 Thread(s)
Quoted: 2380 Post(s)
Liked 1,540 Times
in
1,072 Posts
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.
Rather like those modern guys who refer to seatpost diameters at 27 dot 2 when it is actually a decimal point, not a dot.
