When sizing recumbent bikes and trikes, in addition to your height and weight, we also need additional measurements. X-seam is the most important measurement, along with your inseam, to help us in setting the length of the trike so you can reach the pedals with proper leg extension. If you are getting a recumbent bike or trike with a hardshell seat, seated shoulder height is important for determining seat size. For sizing of older models of recumbent bikes, like Volae, we also need the arm length and standing shoulder height to determine stem length. It is helpful to have someone else measure you, for the most accurate of measurements.
Proper X-Seam Measurement
Arm Length/Seated Shoulder Height
For arm length, sit with your back against the wall and shoulders in a neutral position (Extend your shoulders all the way forward, then push your shoulders tightly back against the wall - neutral is the comfortable position in between). Measure from the wall to your knuckles, as shown. For seated shoulder height, measure from the top of the shoulder bone to the floor, as shown.
Standing Shoulder Height
Measure from the top of the shoulder bone to the floor, as shown.
While standing against the wall, position a book or board snugly as shown. Make sure the top edge of the book or board is parallel to the floor. Measure your inseam as shown.