Originally Posted by
ColonelSanders
If one isn't looking at weird aero shaped wedge seat posts, the three most popular standard sizes for seat posts are 25.4mm(but rapidly diminishing), 27.2mm(the most popular choice) and 30.9mm.
So I want to see seat posts come in one of those 3 sizes, so I have plenty of options in getting the seat post of my choice.
Cannondale like to use 25.4mm because they say it has more compliance and that's fair enough, but what does 26.8mm give you over 27.2mm? Just less choices in seat posts.
Yes, I totally understand. I am often riding my Rivendell or my Trek 950 (which also uses a 26.8 post) and think to myself, man this ride would be so much more enjoyable if only the diameter of the seatpost was a little larger.
Seriously, if you're buying a Rivendell you don't even have to worry about seatposts at all. Any Riv frame includes a seatpost, bottom bracket, and headset.