Originally Posted by
mechBgon
The correct diameter for a 2004 Trek 4300 is 31.6mm, as per Trek's official spec sheet and their tradition of using 31.6mm. Sounds like someone crammed the seatpost off a Specialized in there, since 30.9 is Specialized's signature size.
well now you've got me doubing my measurements! lol
can you post the link to the official spec sheet? Thanks