Why don't cars use full-size spare tires? How many kilometers can a car run with a spare tire?

Nowadays, every car has a spare tire for emergency use. Many cars have spare tires that are smaller than the original tires. This is often called a non-full-size spare tire. So why not use a full-size spare tire? How far can you drive with a spare tire?

Why don't cars use full-size spare tires?

Spare tires are actually mainly divided into non-full-size and full-size, as well as zero-pressure tires.

Generally, a car will have a spare tire, but some cars have a spare tire to remind the owner to check and replace the problematic tire in time, so a slightly smaller non-full-size tire is used. After all, long-term use of the spare tire will bring potential safety hazards.

For car manufacturers, using non-full-size tires can better reduce costs. After all, the price of an original tire can be several thousand yuan, and the more expensive ones can even cost tens of thousands.

Another reason is that cars have limited space. A full-size spare tire is the largest of the three types of spare tires and will take up a lot of space when placed in the car, so manufacturers will choose a non-full-size spare tire.

In any case, the spare tire cannot be used frequently. You must check the tire pressure regularly to better ensure driving safety.

How many kilometers can a car run after replacing the spare tire?

The mileage that a spare tire can be used for varies from car to car, and there is no uniform standard.

If it is a full-size spare tire, and the wheel hub and tire used are the same as those on the wheel, then after replacing the spare tire, it can be used like a normal tire, but please note:

Whenever you check your tires, remember to check your spare tire. If you replace your spare tire and find that it is flat, it will be of no use.

Although the machine can operate normally after replacing the spare tire, since there is no extra spare tire, we should go to the tire shop for repair and replacement as soon as possible to avoid the situation where there is no spare tire for emergency next time the tire bursts.

If it is a small spare tire, after replacing it, in addition to the mileage limit, there will also be a speed limit. Usually there will be a mark on the tire to indicate the maximum speed and maximum mileage. Generally, the speed limit of a non-full-size spare tire is 80KM/hour. It is best not to exceed this speed. If you exceed this speed and drive for a long time, it will cause a "standing wave" effect.

Is the spare tire the same as the original tire?

There is a huge difference between a car's spare tire and the common tire, which is mainly reflected in the following points.

1. Size: the spare tires of most vehicles are not full-size.

2. Quality. The quality of a spare tire is different from that of a common tire.

3. Rims. Most cars’ spare tires are made of iron rims rather than aluminum alloy rims.

So what causes this difference? The main reasons are as follows:

1. Cost. In order to maximize profits, manufacturers will definitely save as much as possible.

2. Space. Some vehicles are no longer designed to accommodate a spare tire of the same size as the long tire.