Automobile spare tires are divided into two categories: full-size spare tires and non-full-size spare tires. If it is a full-size spare tire, since the original tire and the full-size spare tire are of the same size, there are no restrictions on the mileage or speed when driving with the spare tire, and it is possible to drive at high speeds up to 100 km/h. However, if the spare tire is a non-full-size spare tire, the driving speed should not exceed 80 km/h, and when replacing the tire, it should only be used on non-driving wheels. Non-full-size spare tires are only suitable for short-distance driving at low speeds, and the normal tire should be replaced as soon as possible after the tire is repaired. Full-size spare tires can be used without distance limitations, just like normal tires, but it is still advisable to repair and replace the normal tire as soon as possible, clean the spare tire, and store it in the trunk as a professional backup tire. This is mainly because, whether it is a full-size or non-full-size spare tire, their nature is the same—they are only for emergency use and cannot be used long-term. The specifications of spare tires are as follows: 1. Full-size spare tires: Although the tire width is the same, other parameters may differ, such as tread pattern, speed rating, load index, etc., which can affect driving safety, especially posing risks at high speeds. Additionally, the material of the full-size spare tire's rim may differ from that of the normal rim. Most rims are made of alloy, while spare tires may have steel or iron rims, differing in weight and heat dissipation. Therefore, full-size spare tires should not be used as new tires. 2. Non-full-size spare tires: Non-full-size spare tires are narrower than the original tires and should never be used as normal tires. Otherwise, braking and driving power may decrease, and uneven tread on both sides may cause the vehicle to pull to one side. This can significantly impact the vehicle's braking performance and handling, compromising driving safety.
