How To Measure Wheel Offset On A Car

If the value of the backspace is lower than the centerline of the wheel you will end up with a negative offset. This is done by laying the wheel face down so the back is facing up towards you. The front wheel measurement is where the confusion comes from.
how to measure wheel offset on a car

Zero offset would mean the hub mounting surface is even.

How to measure wheel offset on a car. A measurement of zero millimeters of wheel offset means that the hub inside the wheel sits exactly in the middle of the wheel. Measuring from the back of the wheel center to the edge of a 4 off weld left rear wheel youll come out with four inches. You will want to measure from the barrel section and not to overall outside width see picture below. Take the floor to straight edge measurement and halve to get the measurement for the centerline of the tire.

Wheel offset the offset of a wheel is the distance from the hub mounting surface to the center line of the wheel. A weld front wheel doesnt have a wheel center bolted to the back of it to make up the inch difference. Meaning the mounting surface is 40mm away from the centerline of the wheel. Lay your ruler across the inboard flange.

It can either be positive or negative. Divide the measurement by 2 to find the center line. In our example the wheel offset is positive 40 mm. For example if the measurement was 244 mm 96 in then the center line measurement is 122 mm 48 in.

The offset of a wheel is the distance from its hub mounting surface to the centerline of the wheel. Wheel offset is measured in millimeters. To compute the wheel offset all that you have to do is to subtract the centerline from the backspace. Wheel offset wheel offset is the distance in millimeters from the mounting surface of the wheel and the wheels centerline.

On the other hand a wheel offset which is positive means that the hub of the wheel sits on the outside of the wheel. Take the measuring tape and measure the distance from the rule to the hub mounting pad in inches. Given this it can be one of three types. If the centerline is four inches and if the backspace is two inches this means that the offset is negative two.

Determine the wheel backspace measurement. When you do the same for it youll get 5 inches. Wheel width measuring the wheel width is similar to measuring the diameter. You will need this number to calculate the offset.