Wheel Offset & Backspacing Calculator
Wheel Offset (ET)
Offset is the distance from the wheel's mounting surface to its imaginary centerline.
Backspacing
The distance from the mounting surface to the physical back edge of the wheel.
True Backspacing
5.52
Inches
The "Plus One" Rule: Backspacing is measured to the very edge of the wheel's lip. Because the advertised width (e.g., 8.5") only measures the tire seat, we must add 1 inch to account for the physical metal flanges on both sides.
