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What does the J value of a wheel hub represent?

1 Answers

VanEliza

07/29/25 11:47pm

The width of a wheel hub is indicated as 7J, 8J, etc. Here, the number represents the width of the wheel hub, while the J denotes the shape and height of the wheel hub's flange. Considerations when installing based on J value: 1. Issues during wheel hub modification: For example, if the original wheel hub is 6JX15 inches and the original tire is 195/65/15, and you come across a wheel hub with a width of 8JX17 inches, if you want to modify to this wheel hub, the standard tire should be 235/45/17. The flatter the tire, the harder it is to find. 2. During the modification process: Based on the J value, choosing which width of tire depends on what you want to achieve. Selecting a point within the range affects handling and ride quality (comfort). Choosing the midpoint balances both (but slightly compromises both). Opting for a narrower tire affects handling, while a wider tire affects comfort. 3. During wheel hub modification: The aspect ratio of the tire is also an important factor. The aspect ratio refers to the ratio of the height from the rim to the tread relative to the maximum width of the tire's cross-section, expressed as a percentage. For example, a tire with the specification 205/60R15 has a maximum cross-sectional width of 205 millimeters, an inner diameter of 15 inches, and an aspect ratio of 60.

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