Ladies Bikes - What are you riding?

I doubt bigger wheel would make it easier and faster to be honest, my commute on my 20" wheel bicycle is pretty much the same as my 700c bicycle.

Concerning 700c wheel on a tiny frame, wouldn't the short top tube mean that there's a bigger chance of toe overlap? (even on normal frame).

Small bike, small rider, small feet = no toe overlap

Not a prob even on my 46cm frame with 700c