[QUOTE=cyclezen;13231378]try to use the top tube length as a benchmark around which to 'compare'.
with a 'compact' frame (sloping toptube vs a horizontal TT) you can easily go the 56 with your inseam.
I would - triple check your inseam measurement...
it's not that uncommon to be that inseam short for someone 179 tall, but it is unusual enough to skew the fit calculator...
My legs are really short for someone my height. My girlfriend is 5ft 5in and her legs are almost as long as mine.
I went back and rode both bikes again this afternoon.
I barely have any clearance between the top tube and my Man parts when standing flat footed over either bike. Is that something i should be concerned about ?