Do airless tires exist?

Yes, airless tires do exist and are already commercially available for certain applications, though not yet widely available for regular passenger cars on highways. Airless tires, also called non-pneumatic tires or flat-free tires, are tires that do not contain pressurized air but use solid rubber, foam, or flexible spoke structures to support weight, so they cannot go flat from punctures. Examples that exist now include Michelin Tweel, which is a commercial airless tire for skid steers, lawn mowers, and construction equipment, using flexible poly-resin spokes, and has been sold since 2005. Amerityre and Marathon make flat-free solid tires for hand trucks, wheelbarrows, lawn mowers, and golf carts. Tannus makes airless bicycle tires using foam. For passenger cars, Michelin Uptis airless prototype exists and is in testing with GM, aiming for commercial release, but has not yet received full DOT approval for highway use. Military and off-road vehicles also use airless concepts. So airless tires definitely exist and are in use today for off-road, industrial, and low-speed vehicles, providing benefits of no flats and low maintenance, while car versions exist as prototypes in advanced testing but are not yet sold to general public for highway cars.