You hear it a lot that Chuck Taylors are flat. Many weight lifters have used them in competition over the years because it puts their heel more in contact with the ground than other shoes. I'm sure to the general public they feel like flat shoes. But are they truly zero-drop (0 mm) or what is the heel-to-toe drop/differential? I have done extensive online research and can't find the specs anywhere. I have also tried contacting Converse customer service (which is actually Nike, which has owned them for many years), but the reps don't seem to have a clue what I'm talking about and claim they don't have the info. Surely someone out there knows the heel-to-toe specs on these - can anyone verify this?