The stairway walks line is usually located 12 inches from
the inside of the stairway. Most of the stair tread minimum measurements
are taken from these points on circular, winder and spiral stairways.
If you could imagine walking up a set of stairs, holding on to the
handrailing, there is a good chance that you're going to be about 12
inches from the interior handrailing of the stairway (providing that
you're holding on to the interior handrailing and not the exterior
handrailing of the stairway).
If you look at a stairway that's been used for more than five years, you
will notice that most of the wear and tear on the stair treads is
located about 12 inches from each side, in the center of the stairway.
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