What does ET value mean?

[SaraDella]

Tire ET value refers to the offset value, which is the deviation between the mounting surface of the wheel hub and the centerline of the rim, measured in millimeters. Below is an introduction to ET value: 1. Introduction: ET value is also known as ET offset. The ET value is the Off-set value, indicating the offset, which is the deviation between the mounting surface of the wheel hub and the centerline of the rim, measured in millimeters (MM). It can be positive, zero, or negative. 2. Definition: Off-set is defined as the distance between the wheel's mounting surface and the center of the rim. A positive offset (Positive Offset) is when the mounting surface is towards the outer side, while a negative offset (Negative Offset) is when it is towards the inner side of the rim. 3. Considerations: Changing the wheel's offset will alter the vehicle's track width, which is the distance between the centerlines of the tires. Therefore, simply increasing the size of the wheel and tire without changing the offset will not affect the track width.

[StGage]

When I first got into car modifications, I was also confused about the ET value. It actually refers to the wheel offset, which describes the distance between the wheel hub mounting surface and the centerline, measured in millimeters. A positive value means the wheel sits more inward, while a negative value makes it protrude outward, affecting both the car's appearance and handling. I once changed my wheels without matching the original ET value, and they kept grinding against the brake discs during turns, making a screeching noise. The issue was resolved only after switching to the correct ET45. This is quite crucial—ignoring it during wheel changes might increase fuel consumption or accelerate tire wear. Safety-wise, ensuring proper wheel positioning is essential to avoid accidents. Checking the ET value is simple; it's usually engraved on the back of the wheel hub, or you can look it up online by entering your car model. Beginners must understand this before making any changes.

[StBella]

Having been in the car modification scene for a long time, I'm very familiar with ET value, which is the offset measurement of the wheel hub, telling you the positional relationship of the wheel when mounted on the car. A positive ET value like +40 means the wheel sits further inside the car body, while a negative value like -20 makes the wheel protrude outward. When modifying cars, I found that reducing the ET value can widen the track and improve cornering stability, but if it's too high, it might interfere with suspension components. In practical applications, when changing to new wheels, it's essential to check the ET value; otherwise, increased tire noise or brake interference are common issues. It's recommended to use a calculator to compare old and new ET values, keeping the difference within 1 to 2 millimeters. During routine maintenance checks, if the ET value is incorrect, uneven tire wear will indicate the problem. Safe driving depends on attention to detail.

[Tami]

The ET value is a crucial parameter of a wheel, specifically referring to the distance from the mounting surface to the centerline of the hub, measured in millimeters. It controls the position of the wheel: a positive value means the wheel is positioned inward, while a negative value means it's positioned outward. Incorrect ET values can cause numerous issues: wheels too far inward may rub against the suspension, while wheels too far outward can accelerate wear on the inner side of the tire and even lead to loss of control during turns. I once experienced difficulty in steering due to an excessively large ET value. It's recommended to check the original ET value of your vehicle (usually around 40) during routine maintenance and ensure strict matching when replacing parts. If unsure, consult a professional shop for measurement to ensure safe and smooth driving.