Enter the measured backspace (in) and the wheel center distance (in) into the Calculator. The calculator will evaluate the Car Rim Offset. 

Car Rim Offset Formula



  • CRO is the Car Rim Offset (in)
  • MB is the measured backspace (in)
  • WCD is the wheel center distance (in)

To calculate Car Rim Offset, simply subtract the wheel center distance from the measured backspace.

How to Calculate Car Rim Offset?

The following steps outline how to calculate the Car Rim Offset.

  1. First, determine the measured backspace (in). 
  2. Next, determine the wheel center distance (in). 
  3. Next, gather the formula from above = CRO = MB – WCD.
  4. Finally, calculate the Car Rim Offset.
  5. After inserting the variables 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.

measured backspace (in) = 4.234

wheel center distance (in) = 1.23