Tubeless tires are identified by the word ___ on their sidewall.

• A. Tube
• B. Tubular
• C. Tire
• D. Tubeless

Answer: (D)

The word shown on the tire sidewall tells you how the tire is built and how it’s meant to hold air. Tubeless is the designation used to indicate the tire is designed to operate without a separate inner tube; air is retained by the tire and rim bead seal, so maintenance and mounting procedures assume there is no inner tube. This makes it clear that you wouldn’t install an inner tube in this tire, and it guides how you handle punctures and inflation. The other terms refer to different tire types: a tire marked as having a tube uses an inner tube inside the tire; tubular tires are a different construction glued or mounted to a specific rim; and the word tire alone is just a generic term.