http://www.bikeforums.net/showthread.php?t=430228
Originally Posted by
Lt.Gustl
The seatpost is 27.7 and the seat tube OD is 35.3 or so and again the rear spacing is 126
I got the diameter by measuring the circumference and dividing by Pi or something like that
I know it's more than 33mm because that's how wide the jaws of my adjustable wrench go.