If a cheap office chair happens to fit your body shape and preferences, it's ergonomic for you, even without adjustments. It's just a crap shoot as to whether

If a cheap office chair happens to fit your body shape and preferences, it's ergonomic for you, even without adjustments. It's just a crap shoot as to whether or not the fixed adjustments of the cheap chair will match the settings you would select on an adjustable chair, and if the materials are fine for your size and weight. If they do, hey you got a great deal on a decent chair specifically for you. I'm a pretty light guy, and I think I've only owned two <$150 chairs since 2002.