1. The speed should not exceed 80 km/h. That's understandable since he's just a spare spare tire. Wearing shoes of different sizes for both legs can be uncomfortable and can cause damage to the frame and driveshaft if they are too light.

2, mileage limit, timely replacement. In the same way, long-term use will cause damage to the car body. Under normal circumstances, the tires should be replaced within 100 kilometers, but if the tires are too far away, you must slow down and replace the spare tires at regular intervals.

3. For wheels without transmission. The non-full-size spare tire has a lower load-bearing capacity, so it cannot provide grip like a normal tire, so it cannot be used for the driving wheel and steering wheel, otherwise it is prone to side slip.

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