Definition: Lubing your bike chain prevents it from rusting and allows for smoother shifting. Use anything from oil to heavy duty grease to get the job done. A dry chain lube will evaporate and leave behind a dry film (which is typically Teflon-based). This type of lube is ideal in dusty conditions as they won’t attract dirt. As such, wet chain lubes feel wet after application and will protect the chain better in wet situations.