79pmooney - Yes to salt and sand on Iowa roads and highways during the Winter months. Hard enough to get around town as is, can't imagine maneuvering my vehicle without them on the roads.
KatieC - Was wondering what to do during the Winter months myself and this will probably be my first year bike commuting in Iowa. To avoid wear and tear on the bike components, I think it's worth the money to get a belt drive bike for year-round riding if it's in your budget. Been leaning towards the Priority Onyx Continuum for this purpose with studded tires.