All air-filled tires have inner bladders that hold air. In a tubeless tire, the bladder is not a separate, removable inner tube like a bike might have; it is actually part of the tire. A quick and easy way to identify a tubeless tire is by checking the air valve. If you have a tubeless tire, the air valve will be attached to the rim. If your tire has an inner tube, the air valve will not be attached to the rim.