Standing doesn't seem to bother my knees. I only get slight knee soreness from pushing multigear bikes hard enough to keep up with others. Cranking a fixed large gear up a hill is mostly body weight, pulling on the bars, and maintaining momentum. I ride flat pedals, so I'm not pulling up with my back leg, either. I could eke out a little extra speed or distance before walking when I was clipped in, but it's not worth the hassle. The difficulty of singlespeeding is vastly overrated. Work is work.
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