Originally Posted by
Steve_sr
The specs on my frame drawing say 31.6mm. I don't think that there is a standard 31.8 seat post. I think a lot of folks get confused as 31.8mm is standard clamp size for handlebars.
I agree that there was some confusion here and there, but while not "standard" (whatever that means) there were 31.8mm posts, and bikes that used them. This is first hand info, since I sold plenty of them 20-25 or so years ago.
However, the fact that you can find a post that might fit better, doesn't excuse the builder from delivering a frame built to his own specs.
It's not your job to make do to compensate, it's the builders job to do right in the first place.