In the context of wheels, “ET” stands for “Einpresstiefe,” which is a German term that translates to “offset” in English. The offset of a wheel is a crucial measurement that determines how the wheel sits in relation to the suspension and body of the vehicle.
Understanding Wheel Offset (ET):
Definition: The offset is the distance between the centerline of the wheel and the mounting surface (where the wheel attaches to the hub). It is measured in millimeters (mm).
Types of Offset:
- Positive Offset (ET): When the mounting surface is located towards the front (or wheel side) of the wheel centerline. This typically pushes the wheel inward, closer to the vehicle’s suspension.
- Negative Offset: When the mounting surface is towards the back (or brake side) of the wheel centerline. This means the wheel extends outward from the vehicle.
Zero Offset: When the mounting surface is aligned with the centerline of the wheel.
Measurement: The ET value is often stamped on the back of the wheel, indicating its offset. For example, a wheel with an ET of +35 means that the mounting surface is 35 mm towards the front of the wheel centerline.
Importance of Offset:
- Clearance: Proper offset ensures that the wheels do not rub against the suspension components, brake calipers, or the body of the vehicle.
- Handling: The offset can affect the vehicle’s handling characteristics. Positive offsets are more common in front-wheel-drive vehicles, while negative offsets can provide a wider stance for better handling.
Aesthetics: Many car enthusiasts choose specific offsets for aesthetic reasons, as they can affect how far the wheels sit inside or outside the fenders.
Compatibility: When replacing or upgrading wheels, it is essential to choose wheels with the correct offset for your vehicle to maintain proper handling and avoid potential issues with fitment.
In summary, the “ET” value is a critical specification for wheels that impacts both the mechanical performance and visual appearance of a vehicle. When selecting new wheels, it’s important to consider the offset to ensure compatibility and optimal performance.