Wheel Offset, Backspacing & Width Calculator
Use either mode: enter Width + Offset to get backspacing, or enter Offset + Target Backspacing to get a recommended width.
Enter Your Wheel Specs
Backspacing
Front Spacing
Recommended Width
Spacing (from result)
Formulas: Backspacing(in) = (Width+1)/2 + Offset(mm)/25.4. Inverse: Width(in) = 2×(Backspacing − Offset/25.4) − 1.
Visual Diagram
Blue bar = mounting face. Backspacing is distance from the hub to inner wheel edge.
What Is Offset?
Offset is how far the wheel’s mounting face sits from the centerline of the wheel. Positive offset moves the wheel inward. Negative offset moves it outward (more “poke”).
What Is Backspacing?
Backspacing is the distance from the hub to the inner wheel lip. It shows how close the wheel sits to suspension and brakes. Too much backspacing can rub inside parts; too little can poke past the fender.
FAQs
How do I choose a safe backspacing?
Many trucks/SUVs land ~4.5–6.0 inches, but each vehicle is different. If you’re adding big tires or a lift, message us and we’ll double-check fitment.
Why add 1″ to wheel width?
Wheel “width” is bead-to-bead. The physical overall width is about one inch more due to lips, so the calculator uses that for accurate spacing.
Can offset fix rubbing?
Sometimes. More negative offset can clear inside parts, but may increase poke. Fenders, liners, and tire size still matter.
Do I need spacers?
Spacers move the wheel outward (like adding negative offset). Use hub-centric spacers and correct stud length.
Need exact guidance? Our team checks every order for proper fitment — no guesswork.
