Originally Posted by
mihlbach
Thats because sizing a bike by its seat tube or standover is meaningless. How many times does this need to be stated?
People often report that the bareknuckles run large. They do not. A cm is a cm and my bareknuckle is exactly the claimed size for all the tube dimensions. It doesn't have an unusually high standover. My bareknuckle fits the same as all my other bikes, BECAUSE I BOUGHT THE CORRECT SIZE, IRRESPECTIVE OF HOW THE SEAT TUBE WAS MEASURED. The bareknuckle is sized c-c and it has a horizontal top tube. A 54 frame measured c-c is basically the same as a 56-60 measured c-t, depending on how high the seat tube extends from the frame. The 56/57s you have ridden were probably measured c-t and/or were some sort of compact geo virtual seat tube length. There's more to frame size than one number..you have to look at all the tube lengths, understand how they were measured, and the effects that the angles will have on size.
you've completely neglected BB height in your analysis.
BB height part of the reason why the "size your track bike 1-2cm smaller than your road bike" rule of thumb exists.