Originally Posted by Duragrouch

The problem with a single-speed is not just loss of efficiency, even if humans are capable of a wide torque band; Pushing hard on a tall gear while sitting in the saddle puts much more stress on the knees, and you'll regret it over time. It's different if you have the ability for long climbs out of the saddle with your legs much straighter. I rode a recumbent for a time on tours because it took the pressure off my hands, but inability to stand on climbs took its toll on my knees, so I switched back to a conventional bike but with aero bars to move the pressure from my hands to my forearms near the elbow. My recumbent just didn't have low enough gearing, riding a long uphill grade with a touring load. These days there are more solutions for that, but I still want the ability for standing climbs, and bringing a LWB 'bent up and down stairs was a bear.