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I recently wanted to upgrade the wheels and tires on my car. The standard wheels are 17″ and I want to upgrade them to 19″. My car is an Audi SUV, and when I looked at the same wheel shape, 19 inches, a brand of a certain brand sold for about 1200, while the original Audi cost about 6000. I would like to know what are the considerations in choosing the wheels? What is the technical content here? I hope that people who know how to answer, thank you.

I am engaged in the foreign trade of auto parts products, this year began to focus on wheels and learn about three months. Try to answer.
First of all, the subject should be clear that wheel modifications can not be separated from the tires to talk about. Such as the subject from 17-inch upgrade to 19-inch wheels, wheel diameter and width of the increase you need to adapt to the tires are bound to be different. I am not good at this aspect of tires, if the subject is not clear, you can search for several American brands for comparison.
Second, about the wheels, because the aluminum wheels compared to steel wheels, its lighter weight and strength and easier to make into a variety of shapes under the same conditions. Therefore, I only talk about a few points from the perspective of aluminum wheels combined with the subject’s doubts, as follows.

1. Manufacturing method
The mainstream manufacturing methods of aluminum wheels are forging and casting. The difference between these two methods can be simply understood as follows: casting is to heat the aluminum ingot into a liquid state, injected into the mold after cooling; forging is to be placed on a flat mold at room temperature or heated to become soft (no morphological changes), and then extruded with a press of 8000 tons – 10,000 tons of aluminum plastic deformation into a wheel rim.
Because of the casting method, the aluminum form has changed, and need to enter the closed mold, so it is inevitable that impurities and air will seep in, if the factory’s process is not good, more likely to occur shrinkage, hollow quality problems.
The forging process does not change the shape of the aluminum so as to avoid the infiltration of air, impurities, etc. At the same time, due to the high pressure of the forging machine, the forged wheels have a higher molecular density and a tighter structure, which means that they are lighter and stronger than cast wheels with the same specifications.
At the same time, a gravity casting machine on the market is priced at about 20-30,000 RMB, and a low-pressure casting machine is priced at about 100-200,000 RMB. Compared to Japanese forging machines, which cost around 20 million RMB, and German-made machines, which cost around 50 million RMB.
The above costs determine the huge difference in the natural price of forged and cast wheels. Of course the pursuit of performance owners should not care to spend about 100,000 to buy four forged wheels, not why, in order to reduce the weight under the spring to enhance performance na!

2. Notes
Purchase: due to the difference in manufacturing costs, a treasure on the cheap goods are bound to be casting production, but also is bound to be the most common gravity casting production, so its mold accuracy and production level is not as good as the quality of the original wheel supply manufacturers is also obvious. What’s more, I understand that some brand agents of a certain treasure product quality water is extremely high. Even a so-called forging brand claims to have 8000 tons of forging press level, in fact, only 4000 tons of pressure level, OEM factory and address is also known, not up to the real high level of forging wheel hubs.

3. Other
Please note that the wheel upgrade is not the bigger the better, in the selection of the shape at the same time to take into account the weight of the wheel. If it’s just for looks
Upgrade the large size of the wheel at the same time increase the weight, will inevitably lead to the weight of the car to increase the state of fuel consumption.
If the subject upgrades from 17-inch original wheels to 19-inch wheels, pay attention to its weight not to weigh too much when buying.
Conclusión.
Since the subject can drive AUDI SUV, I believe that money is not a big problem for the subject, your concern should be the difference in quality.
So compared to a variety of domestic brands on a treasure, you can be informed of the OEM factory level, management level and other related information are very little. Then please try to avoid a treasure to buy.
Of course, it is not recommended that the subject change to forged wheels, one because the same funds the subject can buy a lot of casting wheels for fun, the second is because a lot of cash foundry using low-pressure casting, spinning casting and other casting methods closer to the level of forging, so as long as the strength of the brand or factory, enough to meet our daily use.

Although the vast majority of the so-called U.S. Japanese brands are looking for domestic factories OEM, but their quality and product requirements are really higher than domestic manufacturers of their own brands