What Is Wheel Offset?
Wheel offset is the distance in millimeters between the wheel’s mounting surface (the hub face) and the exact centerline of the wheel. It is usually stamped on the back of the wheel as "ET" (from the German “Einpresstiefe”), followed by a number, for example ET45 or ET12. Offset determines how the wheel sits in the wheel arch — tucked under the fender, flush with it, or sticking out beyond it.
Positive, Zero and Negative Offset
Positive offset (ET30–ET60) is the most common on modern passenger cars. The mounting surface sits toward the outside of the wheel, pulling the wheel inward toward the suspension. Factory wheels on sedans, SUVs and most European cars typically use positive offset.
Zero offset (ET0) means the mounting surface is exactly at the centerline. The wheel sits evenly in the arch. This is common on many off-road and classic truck applications.
Negative offset (ET-12 to ET-44) pushes the mounting surface toward the inside, extending the wheel outward beyond the fender. It is used on lifted trucks, buggies and aggressive stance builds for a wide track look.
How to Read Wheel Specs
A wheel spec is usually written like this: 18x8.5J ET35 5x114.3 72.6. Here is what each part means:
- 18" — wheel diameter in inches
- 8.5J — wheel width in inches (J is the rim flange profile)
- ET35 — offset in millimeters
- 5x114.3 — bolt pattern: 5 lugs on a 114.3 mm PCD circle
- 72.6 — center bore diameter in millimeters
Why Offset Matters
The wrong offset can cause serious problems: rubbing against the fender or suspension, premature wheel bearing wear, poor steering feel, and even unsafe handling at speed. A correct offset keeps the wheel’s scrub radius and steering geometry within the manufacturer’s design.
How to Confirm Your Correct Offset
- Check the original wheel — the ET number is stamped on the back of a factory wheel.
- Look up your vehicle’s spec sheet — most brands publish factory offset for every model.
- Use an online wheel fitment calculator to preview the difference in arch clearance.
- When in doubt, send us your vehicle model and year — we confirm fitment before production.
Need a Custom Offset?
As a wheel manufacturer, XINCHIDA produces wheels in custom offsets from ET-44 to ET60 in 1 mm increments, in both cast and forged processes. If your build needs a specific fitment, our sales team will confirm the specs and lead time for you.