What is the lifespan of a car spare tire?

[DeBethany]

Car spare tires typically have a lifespan of about 4 years. A spare tire refers to the backup tire for a vehicle, and its specifications are usually the same as those of the original car tires. Functions of tires: 1. Interact with the road surface to generate driving force, braking force, and lateral force; 2. Bear the weight of the car; 3. Provide cushioning and shock absorption. The method to check car tire pressure is: 1. Unscrew the tire valve cap; 2. Press the tire pressure gauge onto the valve; 3. Press the tire pressure gauge all the way down; 4. Observe the pointer and read the measured tire pressure value. Factors affecting vehicle tire pressure: 1. Seasonal factors, with different pressures in summer and winter due to thermal expansion and contraction; 2. Load conditions, with different pressures when the vehicle is empty, half-loaded, or fully loaded; 3. Tire condition, with different pressures for severely worn and unworn tires.