Seems like the track bikes have lower top tubes. With a 58cm my nuts are laying on the top tube. ehkkk!! I'm actually riding a frame size 54cm and I'm 6ft tall. But putting the seat max to the back makes me fit comfortably. I lined the 54cm up with my 58cm bike and the distance from the bar to the seat are identical. But the seat on the 58cm is at the center for the rails.