Thermal plugs are designed to provide what function in tubeless tyres?

• A. Increase tyre stiffness
• B. Pressure relief during excessive tyre heat
• C. Improve fuel efficiency
• D. Enhance tread durability

Answer: (B)

Thermal plugs are a safety feature that provides pressure relief when tyre heat becomes excessive. In tubeless tyres, heat from operation and braking causes the air inside to expand and pressure to rise. If that pressure isn’t relieved, the tyre can fail or burst. The thermal plug is designed to release pressure at a specific high temperature, acting as a controlled vent or fuse to protect the tyre from over-pressurization. This has nothing to do with increasing stiffness, improving fuel efficiency, or enhancing tread wear—the primary purpose is to prevent dangerous over-pressurization due to overheating.