Simply put, "Brace Height" is measured from the centre of the bow grip to the bowstring at 90 degrees. Typically, bows with a lower brace height - for example 6 inches - would be less forgiving than say a bow with an 8 inch brace height.
I'm no expert, and this is a simple explanation as I understand it, but I'm sure others can explain this in more detail.
Brace Height?
