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The main reason to choose a recumbent bike over an upright bike is for safety and/or comfort. In cases where balance is an issue or if the rider is dealing with back, hip and knee pain, a recumbent bike may be a better option.he main reason to choose a recumbent bike over an upright bike is for safety and/or comfort. In cases where balance is an issue or if the rider is dealing with back, hip and knee pain, a recumbent bike may be a better option.
1 Seat height: On an upright bike, start by adjusting your seat to about the height of your hip. Have a seat, placing your feet on/into the pedals. 2  With one leg fully extended (foot flat and parallel to the floor), you should have only a small bend in your kneeâabout 5-10 degrees. The first option, an upright bike, is like a regular bicycle (your legs extend below your torso and your back is not supported), only stationary. 2  Recumbent bikes offer a more relaxed, supported sitting position.