What is wheel backspacing and how is it different from offset?
Backspacing and offset are both measurements that describe how your wheels sit on your vehicle, but they measure it from different reference points. Getting the right combination is key to ensuring proper fitment, clearance, and handling.
Backspacing and offset are two of the most important measurements when it comes to how your wheels fit and sit on your vehicle. While they are related, they measure different things and it is helpful to understand both when shopping for aftermarket wheels.
What is backspacing?
Backspacing measures the distance from the inner edge of the wheel to the mounting surface where the wheel bolts onto your vehicle's hub. It is measured in inches and tells you how much space there is between the back of the wheel and your brakes, suspension, and other components.
Less backspacing means the wheel sits further outward, giving you more clearance on the inside but potentially causing the wheel to stick out past the fender. More backspacing tucks the wheel further inward, keeping it closer to the suspension and brake components.
What is offset?
Offset measures the distance between the centerline of the wheel and the mounting surface. It is measured in millimeters and can be positive, negative, or zero.
- Positive offset: The mounting surface is in front of the centerline, meaning the wheel sits tucked further into the wheel well
- Negative offset: The mounting surface is behind the centerline, meaning the wheel sticks out further from the vehicle
- Zero offset: The mounting surface is exactly at the centerline of the wheel
How are they different?
While both backspacing and offset describe how a wheel sits on your vehicle, they measure it differently. Backspacing is measured from the inner edge of the wheel to the mounting surface, while offset is measured from the centerline of the wheel to the mounting surface. A lower offset generally means less backspacing, which results in the wheel sitting further outward.
Why does it matter?
Getting the right backspacing and offset is critical for proper fitment. The wrong measurements can cause your wheels to rub against your fenders, suspension, or brake components. It can also affect your vehicle's handling, steering feel, and overall safety.
Not sure what backspacing or offset you need?
Use the guided fitment on our homepage to find the right setup for your year, make, and model. You can also reach out to our sales team and we will be happy to walk you through everything and help you find the perfect fit for your build!