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Wheel Backspace to Offset Calculator
This is another simple to use calculator that will help with wheel and rim fitment. This EZ calculator will take a wheel's backspacing and width and convert it to an offset. It's easy to convert from one to the other so you can get the correct fitment for your wheels. Typically Backspace is measured in inches (in) and offset measured in Millimeters (mm). If you need to convert from Offset to Backspace click - Offset to Backspace Calculator.
To Find the the offset given the backspace and rims tire size use this formula: Offset = 25.4 * (Backspace - (Rim's Tire Width + 1) / 2) Where- Rim's Tire Width = Specified Tire Mounting Width for the rim, NOT the total rim width. The common practice is to add 1" to this, and the calculations above has it as well. Backspace = The measured wheels backspace Offset= The results in Millimeters (mm)