Join Date: Sep 2005
Location: Montpeculiar, VT
Bikes: Soma Rush, Fuji Cross, Raleigh Technium Mtn Bike, Ross 10 speed with Shimano 600.
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1"=25.4mm, but there are a lot of different seatpost diameters out there. anmd a 25.4mm won't work in a 25.6mm seat tube without a shim. Even with a shim it might not be as stable. it's amazing how much difference .2mm make.
In other words. try to be sure what size you need before you buy. You'll be a lot hapier with the correct size seatpost. <-voice of experience
Sheldon has a seatpost database on his site somewhere you might find the info you seek there.