Incorrect tire pressure - The majority of tire blowouts are caused by low tire pressure. Due to the low pressure, the tire gets overheated as it flexes beyond its limits causing the rubber to break away from the tire’s internal structure and steel cord reinforcement. This is more likely to happen when you are traveling at a high speed. Also, during summers, the pavement is hot and if the tire is underinflated, it may heat up and burst.
Old tires - If the treads on the tires are worn out and there are cracks in the rubber, it may lead to a tire blowout.