Pedals can tell a story.

In all bike fits you should check for wear, particularly wear on pedals. On Keo pedals one place to check is  the bottom. Rotate the pedal and look under the front area of the pedal. You will usually notice wear toward the inside. See the gray area on this left black Keo pedal.

Why? Most people have a varus fore foot and the inside of the foot is higher than the outside of the foot. When you clip in this natural tilt is forced flat but the foot likes to fight back a bit to try and be more in its natural position – result on the pedal is usually a wear mark of some sort that shows the foot is not in its desired position.

This particular pedal and many others like it show the need to add a wedge. A more even wear is desirable at this area when you do a bike fit.