Steve Freides wrote:
Guy wrote:
Steve Freides wrote:

It was variously 31.5x, so I'm pretty sure
it's slightly-too-small 31.6.



31.6mm is to be the ID of the tube, not the OD of the post.

Sounds like ordering a post that says it's 31.6 mm is what's called
for here, so I should be good. Thanks for clarifying what's being
measured.

You said the post wouldn't hold its position. Shouldn't you be measuring the
seat tube ID instead?