Originally Posted by
onfloat
...As for the tubing, I have no clue. The bike doesn't even have a serial number let alone marks that would identify the tubing.
Check the inside of the bottom of the steerer tube. The better Columbus sets have five spiral ridges. You can also remove the fork. Some manufacturers stamp their logo and a date code on the steerer. The thread standard should be stamped on the bottom bracket cups. The dropouts look like Camapgnolo but I can't tell id there are Portacatena holes. What's the seat post diameter?