premise: A woman in an orange dress riding a bike through the city. hypothesis: The woman is using a two-wheel mode of transportation.
neutral: A bike does not necessarily have two wheels (could have one or three wheels).  Note: This seems to be stretching things. Given the pattern of sentences I've so far encountered, I would have expected the order of these sentences to be inverted. Unless I am missing something all bikes can be considered a (two-wheel) mode of transportation (and if not two-wheel then a tricycle or unicycle).