What's the difference between 7/8" and 7/8"?

Jun 27, 2017
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An old school Wald stem will fit in the seat tube on my old Huffys, but if I take the end of the seat post that's supposed to fit a 7/8" seat clamp it doesn't fit. 7/8" handlebars don't go in either.13/16" seat post just fall right in.

Measuring the end of the post that fits in the bike frame, it looks to be 27/32" and the end that the seat attaches to is just a "fuzz" under 7/8" according to my old Stanley Powerlock tape.

I am waiting for a 7/8" layback seat post I ordered and now I am wondering which 7/8" it will be.

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Jun 27, 2017
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Here they are. 2 old Huffys. A late '70's/early '80's Good Vibrations and a '64 Huffy built Monark Thunderbird. Both have the same odd sized seat post


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Jul 25, 2009
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there are actually 2 sizes of stems like that. One is 22.2 mm and the other is 21.1 mm. similar but not identical...
 
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Apr 20, 2009
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I ran a 13/16" long Schwinn post w/ a shim for a couple of years in my Good Vibrations until I came across a long huffy post on a trashed early mtb style Huffy. Took some effort to get the "right" one in after squashing the clamp on the adapted one.
 
Jun 27, 2017
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Found a solution for a lay back seat post. I've seen this done somewhere before, but never able to try it until now. The stem is marked 22.2, but it dropped right in like a 21.1.


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