I picked up a 1990 Trek 520 over the winter. The price was right and I had been scouting for a used bike I could pack into the back of my small pickup along with all the rest of the camping supplies -- and not worry about scuffing it up or having to pull the fenders off (versus my favored Platypus which had proven to be a bit too looong for the task).
But how to make the 520 comfortable for my old bones? I fitted a VO 1" quill x 80mm with 31.8 so I could mount a Ritchey Ergomax drop bar I had sitting in the parts bin - not bad, but the reach/stack was not quite what I needed. So, I turned to RBW for a Tosco in the 650mm x 31.8 flavor. TaDa!!!