If you are considering whether or not you need orthotics read this article from bikeradar.com
Walking and running come naturally to us but pedaling isn’t a normal state of affairs. “Our feet work by our arches collapsing and energy being stored like a leaf-spring,” says Sean Madsen, a biomechanist at the Boulder Center for Sports Medicine in Colorado and an expert in Specialized Body Geometry (BG).
“That energy is returned during the push-off, when we propel forward. None of that happens with cycling. Riding is a forefoot oriented activity, meaning the arch collapses and stores energy precisely at the point when we want to deliver it.”