I'm afraid that the answer is , "maybe , it all depends , probably not" .
For modern retail details about stem measurements , including the old traditional "U.S. / Japan steerer tube size" :
http://www.sheldonbrown.com/
click on "Parts"
Now , here's what I know :
The first aluminum stems on the post-1959-1960 Schwinn "lightweights" were made in France .
At some point , Schwinn contracted with GB ( England ! ) to make special stems for Schwinn , with that big S in a circle cast into each side of each stem . They were mated with very plain GB handlebars .
The first such stems had an extension which , in cross-section , was T-shaped . There were problems with those . I was told by one Schwinn sales-rep. that there was a recall .
Then next , there were the more standard appearing GB stems . They were the same stems as were used on the Raleigh Grand Prix , Super Course , etc. Except , that they fit the U.S.A. steerer tubes , AND , instead of having "GB" cast into the sides , they had "S" cast into their sides . Down at the very end , completely hidden inside the steerer-tube , these stems have "Made In England" stamped into them .
Then at some point , Schwinn contracted to have the same stems made in Japan . They have "Made In Japan" stamped into them .
Finally , the last versions of these stems , made in Japan , were made with allen-headed bolts .
So ,
There ya go .
( and of course , for smaller sized steerer tubes , French , or U.S.A. , people HAVE taken abrasive-paper to the bottom portion of a stem or two . . . we are not responsible for what happens if you do it that way . . . )
Best Of Luck Mick !
Raoul Delmare
Marysville Kansas
> Could anyone please tell me if a British GB handlebar stem will fit a
Schwinn lightweight?
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> Thats all for now. Keep those wheels spinning, in your memories if not
still on the road. Be lucky Mick Butler Huntingdon UK.
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