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Wheel Offset Calculator

Compare two wheels by width and offset to see how much closer the new one sits to the suspension and how far it pokes out.

Result

Inner edge moves in

2.7mm

Outer edge moves out
22.7mm
New backspacing
6.38in
Current backspacing
6.27in
New wheel sits
2.7 mm closer to the suspension, 22.7 mm farther out toward the fender

How to use the Wheel Offset Calculator

  1. Current wheel width (in)
  2. Current offset (mm, ET)
  3. New wheel width (in)
  4. New offset (mm, ET)

The results update as you type, and you can copy a link that reopens the calculator with your numbers filled in.

What it tells you

  • Inner edge moves in
  • Outer edge moves out
  • New backspacing
  • Current backspacing
  • New wheel sits

Example

Starting from Current wheel width: 8 in; Current offset: 45 mm, ET; New wheel width: 9 in; New offset: 35 mm, ET, the calculator gives Inner edge moves in: 2.7 mm.