On rims, ET refers to the German phrase "Einpress Tiefe", which is a measurement indicating the wheel's offset.
Understanding Wheel Offset (ET)
Offset is a critical dimension for proper wheel fitment on a vehicle. The ET value, often stamped directly on the wheel, provides essential information about how the wheel will sit in relation to the vehicle's hub.
Based on the provided reference:
- Definition: ET indicates the distance between the mounting surface (the part of the wheel that bolts to the vehicle's hub) and the geometric centre of the wheel. This geometric centre is also referred to as the symmetry axle.
- Units: This distance is usually expressed in millimetres.
- Impact on Fitment: The ET value directly influences how far inward or outward the wheel sits within the wheel well. A lower ET value means the wheel is pushed further outward from the hub.
How ET Affects Wheel Position
Understanding the relationship between the ET value and wheel position is key when choosing new rims.
Consider this practical insight from the reference:
- Decreasing ET Value: When the ET value decreases, the alloy wheels will protrude further out from the vehicle's body.
| ET Value Change | Wheel Position |
|---|---|
| Decreases | Protrudes further out |
| Increases | Moves further inward (implied) |
This measurement is crucial to ensure that new wheels clear brake components, suspension parts, and don't rub against the fenders or inner wheel well. Selecting the correct ET value is essential for vehicle safety, handling, and preventing tire wear issues.
