Wheel Offset (ET) Calculator
Calculate exactly how changes in wheel width and offset (ET) move the wheel's inner and outer position, in millimeters.
Current Wheel
New Wheel
Pokes outward
+17.7 mm
Outer face toward the fender
Closer to suspension
+7.7 mm
Inner face toward the suspension
Calculations use nominal dimensions; actual measurements can vary ±1–2% by manufacturer and model. Always follow your owner's manual and door-jamb placard.