My '92 Univega Via Carisma's top tube measures 59cm CTC, over a 58cm seat tube. It felt too stretched out with the original flat bar, a little better with a riser bar and much better with an albatross bar -- the latter is the keeper, both more comfortable and more aero with more hand positions.

No idea whether that applies to other Univega frames. This was one of their Bi-axial Power Oval frames.