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Posted by: Pete TITLE: BALLOON:   stem and steerer tube diameters
Hi,
I~m wondering what the stem diameters were on the old bikes from the 30~s and 40~s.
I~m well versed on standards or lack of on the more modern racing bikes. (modern as in 60~s-80~s)
So was the .833" or 22.2 mm sizes common?
This bike I have (Velvet DeLuxe) has a broken stem and fork steer tube.
I~m not certain but steerer may have already been repaired once before.
The broken stem looks old enough to be original but comes very close to 22.2mm like a modern road bike.
The old stems on ebay never seem to have a size listed. Like one size fits all.
The headset threads are 1" x 24tpi.
That seems like it should have become standard early on.
Did Schwinn have their own sizes besides the bottom brackets? (when did Schwinn start threading BB~s different)
Before I have anyone install a new steer tube I should know if I need one for a .833" stem or 22.2mm stem.
by: 66.216.175.202
Posted by sam
You got any photos of this? By the mid 1920 most american bicycle companies used standard interchangeable parts.Boring-ly standard.A 1924 Schwinn diamond crank is the same crank they used in the late 1970s on their Varsity super sports.Head set cups do very the most.And a very few bikes used non-standard headsets.Stems have little verriation--and that MMs stuff is only useful for modern road bikes--sam
by: 68.93.141.216

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