Originally Posted by
tomato coupe
As others have suggested, you can draw this out on a piece of graph paper and see that the pedal top travels in a circle if the pedal top is always located directly above the pedal spindle.
Nope, no need. Try this, use
your own crank and pedals. Scribe the circle of
your actual cranks. Now figure out what
your actual pedal angle is at say every 10 to 20 degrees when
you pedal (the more data points the better) now place dots where your pedal tops end up at those positions (you can connect those dots as smoothly as possible if you'd like, but not really required). Now find any point inside the scribed circle of your crank that is equidistant from all those points.