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What are the wheel hub specifications for BMW?

2 Answers

AlainaLee

08/30/25 8:16am

Different models have different wheel hub specifications. Taking the BMW X7 as an example, the standard configuration comes with 20-inch wheel hubs, while 21-inch and 22-inch wheel hubs are optional. The specifications for the 22-inch wheel hub are: 275/40R22. Definition of Wheel Hub: A wheel hub is the rotating part of the wheel that connects the tire's inner rim to the wheel center via spokes, which is the metal component mounted on the axle to support the tire. It is also known as a rim, wheel ring, or wheel disc. Wheel hubs come in various types based on diameter, width, manufacturing method, and material. Effects of Wheel Hub Size: Wheel hub size refers to the diameter of the wheel hub. Commonly heard terms like 15-inch or 16-inch wheel hubs indicate the size (diameter) of the wheel hub. Generally, in passenger cars, larger wheel hub sizes combined with higher tire aspect ratios can create a visually appealing tension effect and improve vehicle handling stability. However, this comes with the trade-off of increased fuel consumption.

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VonQuinn

09/12/25 5:06am

I've been repairing cars for over a decade, and BMW wheel specs aren't something you can figure out with just one number! There are significant differences between models and years. For example, the older 3 Series F30 often uses 8J×18 ET30 for front wheels, while the newer G20 might use 7.5J×19 ET25. The key is to look at four parameters: the bolt pattern is usually 5×120, the center bore is 74.1mm, the wheel width is called the J value, and the ET value determines whether the wheel sticks out or not. I've seen cases where people bought wheels online with the wrong ET value, and they ended up rubbing against the fender as soon as they were installed. Before modifying wheels, it's best to check the owner's manual or use a jack to lift the car and look at the inside of the factory wheel—the specific specs are usually engraved there. If you want to save money, go to a professional wheel shop for an accurate measurement. Don't gamble with driving safety!

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