I feel a bit daft asking buts what's a virtual top tube measurement, I'm guessing its the measurement of a top tube when its horizontal as opposed to a sloping top tube.
Cheers Chopper1192, I've been looking at a frame with a virtual top tube length of 58cm and wondered how it compared to my 20" Kona ,favourably by looks of it.
The History Man, I'll have a pint of what you're having!