How to measure diameter of seat tube?
Hi,
I am building what appears to be a mid to late 80's Bianchi, I have yet to determine the exact model.
While shopping for for used campy seat tubes I noticed they come in a variety of diameters such as 26.2, 26.8. 27.2, and so on.
How do I measure the diameter of my own seat tube to ensure that I purchase the correct size seat post.
I've check at sheldon brown's site and the information available there does not cover this.
Can anyone help a mathematically challenged newb?
Thanks
CW