Enter the wheel width and offset into the calculator to determine the wheel backspacing. This calculator can also evaluate any of the variables given the others are known.

Wheel Backspacing Formula

The following formula is used to calculate the wheel backspacing.

WB = (W + 2*O) / 2


  • WB is the wheel backspacing (inches) W is the wheel width (inches) O is the offset (inches)

To calculate the wheel backspacing, multiply the offset by 2 and add it to the wheel width. Then divide the result by 2.

What is a Wheel Backspacing?

Wheel backspacing is a measurement used in the automotive industry to determine the position of the wheel in the wheel well. It is the distance from the mounting surface of the wheel to the back edge of the wheel. This measurement is important because it affects the clearance between the wheel and the vehicle’s body, suspension components, and brake parts. Incorrect backspacing can lead to issues such as tire rubbing, improper vehicle handling, and potential damage to the wheel or vehicle.

How to Calculate Wheel Backspacing?

The following steps outline how to calculate the Wheel Backspacing using the given formula:

  1. First, determine the wheel width (W) in inches.
  2. Next, determine the offset (O) in inches.
  3. Next, use the formula WB = (W + 2*O) / 2 to calculate the wheel backspacing (WB).
  4. Finally, calculate the Wheel Backspacing.
  5. After inserting the values of W and O into the formula and calculating the result, check your answer with the calculator above.

Example Problem:

Use the following variables as an example problem to test your knowledge:

wheel width (W) = 10 inches

offset (O) = 4 inches