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J value comparison table of off-road vehicle hub (off-road vehicle hub data)

From time to time, we have some questions about changing the wheel hub backstage, and I also find that many friends around us are all white in this respect. It's just a brief chat today.

The first most common question: Is it legal to change the wheel hub? Can you pass the annual review?

I can tell you clearly that according to the current traffic regulations, replacing the wheel hub is allowed! As long as you change the wheels of the same size, no matter what pattern and style, it is allowed.

Not only is there no problem with the annual review, but even if you check the car when you sell it in the future, you can easily pass it. For example. You may know that I just bought a BMW Z4 sports car after watching the program a few days ago. The previous owner changed this car with a set of exaggerated thick-edged wheels, and it was no problem when transferring the ownership, because it was the same size as the original car.

The second question: Can you change the wheels of other sizes? Do you need to change the tires at the same time?

Of course, the most convenient and simple thing is to change the original size of the wheel hub, but many car owners who upgrade the wheel hub actually prefer to change the wheel hub with a larger circle, which is understandable. The wheel hub is larger, and the face value and handling will be improved. Moreover, the original wheel hub size of many models is different. For example, my Volvo XC60 has a low T4 version and a high T5 version, which is 18 inches, while my T8 sports version has a different size.

So what should we pay attention to when upgrading larger-sized wheels?

First, it is the issue of regulations. I didn't care about you during the six-year exemption period of the new car, but after the exemption period, there is a possibility that the annual review will fail. Even if you ask the agent to help you pass the annual review, you will definitely fail the test if you don't change back to the original specifications when you sell your car in the future;

Second, the original size of the wheel hub must have the manufacturer's consideration of safety and performance, so try not to increase it too much, and it is best to have the difference within two inches;

Third, as long as you change the wheels of different sizes, you have to change the tires, and you have to recalculate the size specifications of the tires. For example, if the wheels are larger, you have to change the thinner tires. Finally, at present, it is to keep the outer diameter of the whole tire unchanged. Only in this way can we ensure that the driving performance of the car does not find bad changes, and also ensure that the speedometer will not be biased. Then you may download a tire calculator online to calculate the suitable specifications of your new tire. Of course, you can also ask the store where you change the wheels to help you calculate. But the most stable way is:

If your car is a low-grade version, you can check the hub and tyre size of your roof version, and press this to change it. There must be nothing wrong.

The third question is very white, but it is also very common: can the wheels of different cars be universal?

Whether it can be used universally depends mainly on whether the connecting holes left at the joint between the hub and the axle are the same, so the second most important data besides the size of the hub is the hole distance, which is abbreviated as PCD in English. Its usual expression is: N*XXX mm, n is the number of holes, there are 4 holes and 5 holes, and the position of these holes is indicated later; For example, my Volvo is 5*108mm, so only the hub with this hole spacing can be installed.

Generally speaking, the distance between car holes of the same brand is the same. The brands of the same automobile group often use considerable hole spacing. Of course, the hole spacing is consistent with PCD, which can only ensure that the hub can be installed in your car, but does it work? In fact, there are several other important specifications.

The third important data is the width of the wheel hub, usually in J. For example, my original wheel hub is 8.5J, so the width of the wheel hub and the width of the tire should keep a certain correspondence, otherwise it will not fit, or there will be the danger of air leakage or even slippage. This is understandable. Therefore, if the width of the tire you change is the same as that of the original factory, you should change the hub with the same J value. If the width changes, you should change the hub with the corresponding J value. Here is a comparison table.

The last important parameter is offset, which we usually call ED value. What does this mean? In fact, any wheel hub has two important platforms, one is at the center and the other is at the outer end near the tire, so the ED value indicates the relative position of the two platforms. What's it for? You see, it's very direct. Once the hub is connected, the position of the central platform is fixed, so the relative position of the outer platform is different, which will determine the protruding degree of the hub after it is installed. The lower the ED value, the more protruding the hub is, and the higher the ED value, the more concave the hub is.

Generally speaking, you can choose a new wheel hub with the original ED value. However, in several cases, you may need the hub to protrude more: for example, if your car is surrounded and widened, it will look good only if you make the hub protrude more and ensure that the wheel and the wheel arch are still in the same plane; For example, if you upgrade the big piston brake caliper, it won't fit; There are also some professional racing cars, in order to strengthen the handling stability and rollover resistance of the car.

Recently, simply review the four most important parameters of a wheel hub. First, the total size of the hub, in inches; Second, the hole spacing determines whether your hub can be installed; Third, the width, the unit is the big J, which determines whether the width of your wheel hub and tire is the same. Fourth, the offset and ED value determine the protruding degree of your hub after installation, and whether it can be on the same plane as the wheel eyebrows. Haha, remember these four points, and you are the hub master.

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