I think it has to do with foot placement on the pedal. A convex pedal probably works better with softer shoes placed with the arch over the pedal spindle. But if a person likes the foot placed more rearward with the pedal spindle between the arch and ball of the foot, concave is better.
Nov. 29, 2020, 4:44 p.m. - Andy Eunson
I think it has to do with foot placement on the pedal. A convex pedal probably works better with softer shoes placed with the arch over the pedal spindle. But if a person likes the foot placed more rearward with the pedal spindle between the arch and ball of the foot, concave is better.