Re: anyone using these calipers??
those calipers are listed as having 2 x 2" pistons. 2 x 2 x .7854 = 3.1416 x 2 pistons = 6.28 sq in of piston.
That's actually pretty close to the right size which is around 7 sq in.
incidentally, .7854 is equal to Pi/4, which is why the math works out like that.
Too bad they didn't produce those calipers with 2.125 piston, would have been very close to exact.
Tom Terrific or Terrible Tom, depending on the phase of the moon, passing cosmic rays or other factors not fully understood except by my wife.