What Causes Cracking on Tires?
2 Answers
Tire cracking occurs because tires are constantly in contact with the ground, experiencing friction and load, and working in both high and low temperatures throughout the year. Exposure to rain, snow, brake dust, and other elements also plays a role. Although tire rubber contains anti-aging chemicals, prolonged exposure to external conditions can still cause the rubber to lose elasticity, leading to surface cracks. These occasional surface cracks are known as ozone cracking, commonly referred to as 'crazing' or 'cracking.' These small cracks typically appear on the inner and outer sidewalls and tread grooves. Severe cracking can degrade the rubber's physical and chemical properties. Since tires are made of rubber, some degree of cracking is normal after prolonged use. Exposure to air, direct sunlight, exhaust fumes, and ozone pollution can all accelerate the cracking process. Long-term use of tire cleaners can also inadvertently strip away or damage additives like antioxidants and anti-ozonants. Sun exposure or excessive cleaning are just minor contributors to crack formation. Regular driving helps slow down rubber aging, as frequent use and repeated stretching of the tire material can help prevent cracks from forming.
When I bought my first car, I was quite alarmed when I noticed mysterious cracks appearing on the tires. After researching the cause, I learned that tires age over time, making the rubber more brittle. Exposure to direct sunlight and UV rays damages the rubber surface, while incorrect tire pressure—either too high or too low—increases stress and deformation. My car was parked outdoors year-round without any sun protection, which led to the cracks. Additionally, chemical contaminants and pollutants can seep in, accelerating aging. This is seriously dangerous—it could lead to a blowout on the highway. Since then, I’ve made it a habit to check tire pressure monthly, keeping it within the recommended range, and I try to park in a garage or use a car cover. Generally, tires should be replaced every 5-6 years—don’t skimp on safety! If you spot any issues, take your car to a professional shop immediately—don’t take risks!
