What does 275/45-r20 mean on a tire?

[MacElena]

245/45 indicates that the tire section width is 245mm, the aspect ratio is 45%, and R20 indicates that the tire has a radial structure with a rim outer diameter of 20 inches. Below are specific details about vehicle tires: 1. Car tires: Car tires are one of the important components of a vehicle, directly in contact with the road surface. Together with the vehicle suspension, they help absorb shocks during driving, ensuring good ride comfort and smoothness. They also ensure good adhesion between the wheels and the road surface, improving the vehicle's traction, braking, and off-road capability, while bearing the vehicle's weight. 2. Replacement cycle: Typically, tires have a lifespan of 3-5 years, meaning they generally need to be replaced after 3-5 years or approximately 60,000-80,000 kilometers. However, specific requirements depend on driving conditions, temperature, tire pressure, and driving style, as tire wear varies under different circumstances, leading to different replacement cycles.