Originally Posted by
crhilton
Tire clearance with the frame and brakes (most road frames will be setup for calipers and not cantilevers). Typical road framesets won't clear knobby 700x32c tires.
I was thinking it might be something like that. I probably then need to get a list together of frames and sizes that are CX and just check CL periodically. The only problem with CL is that sometimes I think half the stuff on there is stolen, because people have absolutely no idea about what they are selling.