Wheel Offset Calculator
Enter wheel width and ET offset, plus an optional spacer. See backspace, frontspace, and how many millimetres the outer and inner edges move versus a stock wheel. Geometry only, not a fitment guarantee.
Frequently asked questions
Is a positive move outward?
Yes. Positive outer move means the wheel face sits farther out than stock, after any spacer. Positive inner move means the inside edge sits closer to the suspension.
Does this check that the wheel fits?
No. It is geometry only. Brakes, arches, tire bulge and stud length all matter, so check with a fitter.
What is backspacing?
The distance from the mounting face to the inner edge of the wheel. It is half the width plus the offset, using the stated rim width.