Originally Posted by
fietsbob
What ever, done it on a bike with a gear ratio that it takes 3 turns of the cranks to rotate the rear wheel once..?
on a steep , hard to walk up slope ?
yeah, there's definitely a point of diminishing marginal returns where you may as well walk. Somewhere around 2.5 mph at 50rpm. For 700c 28mm tires, that would be a 1:1.5 gear ratio, say with a 24x36 low gear (which is fairly normal for touring bikes)