People drift in rivers and lakes, how can they not puncture?
Always walk by the river, where there is no puncture.
Seen from nowhere, since the ancient times, the broad masses of the people have been plagued by the puncture caused by a flat tire. And before tire manufacturers successfully develop tires that do not have to inflate or leak, tire punctures will still plague drivers.
Since it is impossible to avoid a puncture, it is particularly necessary to master the skills of changing tires. Just not to mention replacing the tires for the time being, just can't find the master where the spare tire is, the cylinder brother has seen a lot. If there is a puncture on the road, where does the owner go to find a spare tire?
People who say “near people†and “shake it†are really enough for you.
Scenario 1
Built-in spare tire
The vast majority of cars on the market use built-in spare tires. The so-called built-in type means that the spare tire is placed in the spare tire groove under the floor of the trunk of the vehicle.
So you just need to open the trunk of the vehicle and lift off the partition at the bottom so that you can see the spare tire lying quietly and waiting for your favor.
Of course, the spare tire can't be said to follow you when you go away, or you have to remove the bolts that are used to secure the spare tire before the spare tire can be turned.
The built-in type can better protect the spare tire from wind, rain, and sunlight. At the same time, it can also make the bottom of the vehicle even and improve the high-speed stability of the vehicle. But the downside is that if you need to change the tires, and the trunk is just full of stuff...
Scenario 2
Bottom-mounted spare tire
The bottom-mounted spare tire, as the name implies, is the spare tire hanging under the car. This form of spare tire is more common in SUV models, and it is almost the same as the position of the built-in spare tire. It is just outside the car body.
If you find your car is a down-loaded spare tire, don't be nervous. The designer won't let you get into the car and get your spare tire. In contrast, the use of bottom-mounted spare tires is even more convenient than the built-in type.
Only need to find the tire changer with the vehicle equipment, insert the special interface in the rear, then rotate the handle, loosen the hinge fastening the spare tire, you can see the spare tire slowly down. After separating the spare tire from the fastening clip, you can use the spare tire.
Since it is so convenient, why is the bottom-mounted spare tire not used on a large scale by the car?
The first is not friendly to spare tires. The environment in which the vehicle's chassis is located is very harsh. A lot of splashing of rain and stone damage can easily make the spare tire hurt.
The second is the requirement for the height of the chassis. Undercarriage requires that the chassis of the vehicle is not only higher than the width of the tire, but also has a certain margin to facilitate the user to take out the spare tire. Many cars cannot do this.
The last is aerodynamic considerations. Bottom-mounted spare tires will destroy the flatness of the bottom of the vehicle. In low speed conditions, the impact may not be great. However, at high speeds, the airflow at the bottom of the vehicle has great significance for the stability of the vehicle.
Scenario 3
External spare tire
In fact, the plug-in spare tire does not have to look for, basically can get the driver's license can find where it is - on the car's tailgate. This type of spare tire is basically used only on SUV models.
There is no doubt that the external spare tire is the easiest to find and easier to use than the built-in and bottom-mounted. The specific operation steps, just unscrew the spare tire's fixing screw, you can use it conveniently.
In addition, some vehicles will add a protective cover outside the spare tire in order to better protect the spare tire, or to prevent the spare tire from being stolen. In this case, it is necessary to open the protective cover and then take out the spare tire.
Why is the plug-in type of spare tire, which may look so beautiful, not widely used?
The first reason is that it is easily stolen. The spare tire is directly exposed, making it easy for thief to steal. The countermeasures taken by the manufacturers are to use anti-theft screws, but this will also increase the level of trouble for owners to change their tires.
The second reason is the effect on the body structure. Earlier, the external spare tire was mounted directly on the door, but the heavy spare tire often resulted in deformation of the door or hinge, so now the external spare tire is mostly hung on a separate spare tire frame.
Also because of the weight factor, the built-in type and the bottom-mounted type do not require the user to spend too much effort, but the plug-in type needs to take the spare tire from a not-low height, and then put the leaky tire on it. Not having a strong muscle can be quite difficult.
The last reason is to add a tire thickness outside the car body. Isn't it too difficult to stop at ordinary times?
Scenario 4
No spare tire
Who is required to have a spare tire, BMW's entire system is equipped with a standard run-flat tire, and can still travel 80 km/h at a speed of 80 km/h if the tire loses pressure. For this reason, the BMW models no longer provide spare tires, and the owner only needs to find a tire shop to repair tires or replace tires.
Of course, other models are based on cost and ease of use. They neither use run flat tires nor spare tires. Instead, they use air pump and tire pack kits. Although the squeezing solution can solve the urgency of emergency, it will not be as safe as a real spare tire if you travel long distances.
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