Measuring the Inseam Length:

Start by taking a large carpenters square, and having the rider stand against a flat wall with their feet about pedal-length apart with their shoes off. Give the rider the square and instruct them to place it between their legs and pull it upwards until it rests against the pelvic arch in the groin. Make sure that they are holding the square flat against the wall, and against the pelvic arch at the same time to ensure that the top of the square is horizontal to the ground.Take the measurement from the top of the square to the ground in millimeters (NOT CENTIMETERS).

Measuring the Torso:

With the square still between the riders legs and flat against the wall, still resting in the pelvic arch, measure from the top of the square up to the super sternal notch (the soft fleshy indentation at the center of the base of the neck.

Measuring the Arm length:

The arm length measurement goes from the end of the clavicle to the outer fold of the wrist with the arm outstretched. To find the end of the clavicle, feel the bone through the persons flesh on the top of the shoulder. When you find it, follow it out toward the arm, where the arm and the shoulder meet, there will be an indentation, mark that, and measure to the “outer fold of the wrist”, which can be found by asking (with the persons arm still outstretched, palm down) to fold their hand upwards. Take the outer- most fold of the wrist as the end of your measurement. ARM STRAIGHT!