Max is the manufacturer listed max and min expansion
range. When you select this, I'll also show you lines
indicating where 10% and 60% expansion range is. Many people
consider 10% and 60% expansion to be a reasonable usable range
for cams, but these numbers may differ from cam to cam and
also depend on your risk tolerance.
Usable is 10% to 60% of the max range, unless a
manufacturer publishes a different number. Metolius is
currently the only manufacturer that publishes a usable range.
When you select this option, the entire bar represents the