BB on old bianchi
 

I have an old 80s bianchi brava it was red and I suspect the BB needs replacing as well as the cranks. I converted it to Fixed gear and I was wondering what sizing i would need to get a good SS crank and a BB to achieve smooth riding and a nice chain line. I am also using one of the original chain rings, should I replace this too?

Check into it first. Might just need cleaned, lubed and adjusted. Might have the size stamped on the BB cups...who knows.