I came up with 26.8, 26.7 with my dialed calipers. I got a 26.8 seatpost worked perfect.. From your readings, I would get a 26.8 seatpost.f

Here is the one I got, kind of cheap, but it turned out perfect.. a black 26.8 seatpost.

http://www.ebay.com/itm/300789520168...84.m1423.l2649

I put it on this..

http://www.cehoward.net/gpyy56.jpg