Fattest Thin Man
Join Date: Sep 2005
Location: Directly above the center of the earth
Bikes: Miyata 610, Vinco V, Rocky Mountain Element
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I have both and I don't think they're any different in regards to ankle movement or stress.
The main reasons folks ride recumbents is because of back/neck or groin problems.
Personally, I prefer the upright. I apparently use a lot of body english when I ride because it feels weird not being able to shift your weight around on the recumbent.