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What does the ET value of a wheel hub mean?

2 Answers

EllieMarie

07/29/25 2:16am

The ET value of a wheel hub refers to the offset between the mounting surface of the wheel hub and the centerline of the wheel rim, commonly known as the offset (Off-set value). Below is a detailed introduction: 1. Types of ET values: (1) Zero-offset wheel hub—indicates that the mounting surface of the wheel hub is located at the centerline of the wheel hub. (Used for SUV models and some BMW vehicles) (2) Positive-offset wheel hub—indicates that the distance between the mounting surface and the centerline of the wheel rim is towards the outer side. (Used for front-wheel-drive and some rear-wheel-drive models) (3) Negative-offset wheel hub—indicates that the distance between the mounting surface and the centerline of the wheel rim is towards the inner side. 2. Larger ET values result in smaller wheel spacing: The larger the ET value, the more the wheel hub will be recessed towards the inner side (reducing the track width between two wheel hubs on the same axle); conversely, the smaller the ET value, the more the wheel hub will protrude towards the outer side (increasing the track width between two wheel hubs on the same axle). 3. The ET value determines whether the wheel hub will rub against vehicle components: If the ET value is too large, it may rub against the vehicle's suspension system, which not only affects the suspension system but also poses safety risks. Therefore, when selecting a wheel hub, it is essential to refer to the original wheel hub's ET value. Of course, adjustments can be made later by adding spacers to reduce the wheel hub's offset.

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LeBlakely

08/12/25 6:16am

The wheel ET value, for me, is a parameter that measures the inward offset distance of the wheel hub from the mounting surface. Simply put, it's the offset of the wheel's position when mounted on the axle. If the ET value is positive, the wheel hub moves closer to the inside of the car body; if it's negative, the wheel protrudes outward. I once ran into a problem when modifying my car—I chose the wrong negative ET value, and as a result, the wheels stuck out too much, rubbing against the suspension components while driving. This not only caused a screeching noise but also accelerated tire wear. That experience taught me that the ET value isn't just about aesthetics—it affects the car's overall balance, brake clearance, and even handling stability. If the ET value is too large, it might interfere with the brake disc; if it's too small, abnormal suspension load could lead to bearing damage. Generally, the ET value of factory wheels ranges between 35mm and 50mm. When modifying, it's best to refer to the original car's specifications or consult an expert to calculate the right value. Safe driving is the top priority—never take it lightly.

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