I'm building up an early 90s Colnago sprint frame that I got cheap on Ebay. I have no previous experience with C&V bikes so I thought I'd ask for some guidance from you guys.

It has a 14cm head tube. I want to go with a threaded set up to keep some of the retro look. So the question is, with a 14cm head tube, what length steerer do I need and how much of it needs to be threaded?

One other question: How do I tell if its an English or Italian thread for the BB?

And thanks in advance for any help!