Well - I haven't seen one of these bikes, but I can answer some of your questions which are non-bike specific
cold work is the term used to describe the strengthening which is obtained by deforming a material without heating it (it's sort of a misnomer, as the material does heat as you deform it) - essentially, what happens is the deformation induces defects in the material which hinder further deformation - thus increasing the stress required to deform the material again - in other words, it's stronger than it would have been if it were undeformed. Cold working lets you have a stronger tube (the work comes from the actual drawing of the tube) for a given material, so you can use thinner walled tubing to get the job done, and end up with a lighter bike. (cold work is lost when you heat the material significantly, such as with welding - the regions near the weld loose some of that strength, so you would need a thicker tube wall in those regions to be as strong as the rest of the tube (see your question on butting below) - this is why air hardening steels are sort of neat - they get stronger when you heat them, allieviating the softening problem)JohnnyCat said:What exactly is cold worked, and does it make a huge difference?
It's probably pretty similar - I do have a question, though - on the Litespeed web page it specifically states that certain tubes are 3-2.5, maybe the others are cp or something like that (and thus are weaker)JohnnyCat said:How is this bike different from Tuscany's of years past that just used straight round tubes?
butting, for a tube, means that the tube has more than one wall thickness along it's length - double butting has two, triple has three, etc. This is done because in many materials, you don't need the wall thickness to be very much in the middle of the tube to get the job done, but you do need it thicker on the ends so that you can weld it more readily - so a butted tube on a bicycle is thicker on the ends than in the middle (just like with butted spokes)JohnnyCat said:Could someone explain what butted means? Serotta brags triple. Seven and many others claim double. Is single butted standard or is it possible to have no butting at all?