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What do the wheel hub data J and ET mean?

1 Answers

JulietFitz

07/29/25 7:23pm

The width of the wheel hub is 7J, 8J. Here, the number represents the width of the wheel hub, while J represents the shape and height of the wheel hub flange. The ET value, also known as the ET offset, is the Off-set value, which refers to the deviation between the installation section of the wheel hub and the centerline of the wheel rim, measured in millimeters. It can be positive, zero, or negative. Below is more related information: 1. Considerations when installing based on J value: Many car enthusiasts encounter various issues during wheel hub modifications. For example, if the original wheel hub is 6JX15 inches and the original tire is 195/65/15, and you see a wheel hub with a width of 8JX17 inches, the standard tire for this modification should be 235/45/17. However, the flatter the tire, the harder it is to find. During the modification process, based on the J value, you need to consider what you want to achieve when selecting the tire width. Choosing a point within the range affects both handling and ride quality (comfort). The midpoint offers a balance (but slightly compromises both). Narrower tires affect handling, while wider tires affect comfort. 2. Considerations when installing based on ET value: Changing the wheel rim's Offset alters the vehicle's track width, which is the distance between the centerlines of the tires. Therefore, simply increasing the wheel rim and tire size without changing the Off-set does not affect the track width. Impact of changing Off-set: Using a wheel rim with a smaller positive Off-set value widens the track width, reducing body roll during cornering and improving the vehicle's cornering speed limit. However, this also increases the distance between the steering axis center and the tire center, making steering more difficult and increasing the load on the steering mechanism, leading to greater deformation of the steering linkage. Therefore, Toe-in must be appropriately adjusted to compensate.

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