C-C to my knowledge means center to center , to find center to top you add the radius of the tube..
since you are wanting a bikes direct, no dealer, bike .. ask them . It's their business not mine ..
if you cannot buy a bike from past sizing knowledge of your own bikes
that may not be the place to get your bike.. and you should spend the money to get a bike you can test ride first.
.. and will be set up and ready to ride.
and have the Local shop help available after the sale..
Last edited by fietsbob; 05-13-14 at 08:23 AM.