Moulton bicycles come in one frame size. This size fits the majority of riders and the low step-through allows the bike to be mounted with ease by both sexes. Below are the wheel size, seat tube and pillar dimensions - along with the respective inside leg-length guides - for the different Moulton models. For your inside leg length, measure from the sole of your foot to the inner top of your thigh in inches - please note that this is a different measurement to your trouser inside leg length.