just read this:The 113 is measured from the FCP
FCP: Forward Contact Point. This point is the farthest forward that still is in contact with the snow. Not necessarily the widest part of the ski, but the point from which sidecut is measured
my pe's are 179 from tip to tip, but if you measure them like other companys via bottom they are longer... also my pe's are about 119mm from the tip.. weird..