Ok, I am really ashamed to even ask this, and I have posted this same ? in the bike mech section of this forum, with no real answer. Jenson has a good deal on seat posts, and I would like to buy one for my 2007 Gary Fisher. Can someone please tell me what size I need, width wise. I have GF bikes from 96 to 07 and all the stock posts are interchangeable for all my bikes , so im guessing there is a standard size for GF bikes. I just don't know what it is.Can someone please tell me? I would like to place a order for that and a few other parts before the end of the week.

Why not try fisherbikes.com or bikepedia.com first? Or looking at one of your seatposts for a size marking?

Did on all first. No markings on any posts. And no sizes listed on either site. Way ahead of you, hence, the reason I ask here.Looking for the wisdom of the great ones.

Pulled up two bikes at random on fisherbikes.com and they both showed 27.2 seatposts...

bikinfool is on top of his game, I pulled one up at random on gf website too ,same result...27.2

FWIW, my Gary Fisher Hifi seatpost is 31.6mm.

Mine are all hardtails, so I will go with 27.2 Thanks for helping me with the research

That's research? I think I did pull up two hardtail models, don't remember now.

I use a ruler or tape

My Tassajara is a 27.2.

What year? That the same bike I am looking to buy the post for. mine is the 07.