Carcass cords are broken up circumferentially at shoulder or sidewall in a line or a saw pattern

Excessive heat generation and fatigue caused by gradual leakage of air due to:

• 1. Unmatched valve core or aged core rubber
• 2. Fine materials such as mud or dust in the valve
• 3. Pin hole (small puncture) or tire and/or tube
• 4. Rust or any fine materials on the bead seat of rim
• 5. Unsatisfactory repair of puncture

Stop to use the damaged tire

• 1. Use tires under the recommended air pressure and load, and check the air pressure periodically
• 2. Use a correct, new valve core
• 3. Use a valve cap to avoid entry of fine materials
• 4. Use new tubes for new tires
• 5. Remove rust or fine materials from the bead seat of rims when tires are mounted
• 6. Repair punctured tires and/or tubes correctly