
Family car tires must be replaced every 60,000 kilometers or 4 years. Tires are circular elastic rubber products assembled on various vehicles or machinery for ground rolling. Rubber products will age after prolonged use. When purchasing new tires, be sure to check the production date clearly, as tires also have a shelf life. Tires are often used under complex and demanding conditions, enduring various deformations, loads, forces, and high-low temperature effects during driving. Therefore, they must have high load-bearing performance, traction performance, and cushioning performance, while also requiring high wear resistance, flex resistance, and low rolling resistance and heat generation.

My car has been running for five or six years, and last month during maintenance, the mechanic reminded me it's time to change the tires. There are two main points to consider: first, the tire tread depth is less than 1.6mm—I tested it by inserting a coin, and the tread is almost worn out; second, there are many small cracks on the tire sidewalls, and the rubber has clearly aged and hardened. I usually drive steadily for school runs and commuting, but the tires didn’t even last five and a half years. The mechanic said that tires older than five years, even if they look okay, will have much worse grip in rainy conditions. He advised not to push it, and after changing to new tires, driving over speed bumps feels much smoother.

Rubber products inevitably age over time, with UV exposure and temperature fluctuations accelerating cracking. I've observed tires on relatives' and friends' vehicles parked outdoors for over six years commonly developing spiderweb-like cracks. Even with only monthly use, the structural integrity of tires deteriorates. This demands extra attention for frequent highway driving - a neighbor's car had bulging tire shoulders last year but kept using them, resulting in a blowout on the expressway. Rather than obsessing over age, develop a habit of inspection during regular stone removal. Replace tires when cracks exceed 3mm depth.

Friends in the rainy southern regions should pay special attention to tire condition. Two years ago during the plum rain season, I drove my old car through standing water and noticed the steering wheel felt noticeably floaty. A check-up revealed all four tires had hardened like rigid plastic. Tire specialists recommend considering replacement after three to four years of use, especially for vehicles regularly parked outdoors. Those in areas with sub-zero winter temperatures should also be cautious, as aged tires are more prone to cracking in cold weather. Once I saw a friend's four-year-old tires with sidewall cracks wide enough to fit toothpick tips - such cases definitely warrant immediate replacement without hesitation over cost.


