Measure the total width of the wheel (X) and then halve this (X/2). Measure the backspace (A) and then subtract “A” from “X/2”. You now have the centerline offset.
Making sure you have the correct offset is important as it will affect where your wheel sits in relation to your vehicle. A high positive offset means the wheel will sit further inside the wheel and might run up against the brakes or suspension. Worst case scenario, you will not be able to steer. A high negative offset means the wheel sits further out from the wheel arch and this can cause the tires/wheel s to rub against the wheel arch. In addition to this you must also be aware of limitations to changes made to your vehicles
