A further important aspect for an optimized foot position is the heel angle resp. the foot alignment. The foot should be parallel to the cranks / the bicycle frame. Small variations to this are personal preference. The correct position can be easily found when the forefoot follows and touches the bent inner stop of the pedal.
People who have knee which bow outwards (bow legged) will be more comfortable with their heals turned slightly inwards. For people with their knees close together (legs forming an x shape) will be more comfortable with their heals turned outwards slightly. If you have other alignment issues, problems with your joints or biomechanic issues then it may be necessary to position yourself differently on the bicycle. If this is the case, we recommend that you contact a bike fit specialist as this falls outside of the framework of the guidelines which we are able to give in these instructions.