Tubeless tires are the demand of the today's customers. Yes, they are a little expensive as compared to traditional tires, but they are worth every penny. They don't get punctured often, and you are never stuck in the middle of nowhere with a flat tire. A tubeless tire must have an air-tight rim to work properly. Almost every bike in the US is fitted with a Universal System Tubeless (UST), which was originally developed by three companies; Mavic, Michelin, and Hutchinson.