How is seat post length measured?

richtw

Does anyone know how the seat post length is measured on Ritchey posts?

I have a post in the bike which I am looking to change 31.6mm diameter, total length of the post is about 360mm from top of clamp to bottom of post.. The bit of the post that states the length is scuffed and unreadable.

Ritchey sell posts in this diameter of 300 and 400mm - the post I have is neither length. So how do they measure them?

Wooliferkins

Measuring from a Ritchey Pro V2 post it is from bottom to middle of rail clamps

EKIMIKE

350mm is a common length for seatposts. It's probably classified as 350mm if you're getting 360mm.

spasypaddy

normally with a tape measure