Is it suppused to go just into the frame or does it have to go below the top tube / seat stay junction? 853 Inbred if that matters?

If it does I think I need a 400 not a 350, and Easton don’t make a 400 as far as I can see, which I wanted to match my bars / stem, hmmm

The minimum insert mark is for the benefit of the post’s integrity. For the frame, the minimum insertion should be, IMO, an inch below the toptube/seattube junction. Use whichever requires the greater amount of post to be in the frame.

nuts, cheers

i need a 400 coz mine is only just poked in the frame