A person's X-seam is a measurement related to the person's height. It is measured from a sitting position with legs outstretched, and is the distance from the lower back to the
soles of the feet. X-seam measurements are used for sizing
recumbent bicycle
A recumbent bicycle is a bicycle that places the rider in a laid-back reclining position, and often called a Human-powered_land_vehicle, human-powered vehicle or HPV, especially if it has an aerodynamic fairing. Recumbents are available in a w ...
s and
ultralight aircraft
Ultralight aviation (called microlight aviation in some countries) is the flying of lightweight, 1- or 2-seat fixed-wing aircraft. Some countries differentiate between weight-shift control and Aircraft flight control system, conventional three-a ...
.
External links
X-Seam Illustration
Anthropometry
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