How To Measure Your Rim Offset

My Globeline rims are still up for sale. During its placement on the ads, i got so many questions about the offset value. The fact that Globeline manufacturer are too lazy to put the offset value behind the rims really gave me a hard time trying to answer this question. I can only show them how the rims look on Charmant fenders but then they ask me the usual offset value for Charmants!

Now, i am back in Jakarta for the weekend, i got the chance to measure the offset myself. Quoting from here, below is some explanation about wheel offset.

The offset of a wheel is the distance from its hub mounting surface to the centerline of the wheel. The offset can be one of three types (measured in millimeters):

Zero Offset
The hub mounting surface is even with the centerline of the wheel.

Positive
The hub mounting surface is toward the front or wheel side of the wheel. Positive offset wheels are generally found on front wheel drive cars and newer rear drive cars.

Negative
The hub mounting surface is toward the back or brake side of the wheels centerline. "Deep dish" wheels are typically a negative offset.

Here's an illustration.

From left to right: positive, zero, negative.

Here's how to measure rim offset.. First measure the rim track width, the distance between inner lips to outer lips. My Globeline measures 204 mm.


Next, measure the depth of the mounting hub from the inner lips. Use another ruler or any straight object placed across the rim and measure the depth from it. Mine gives 104 mm. Take account the "zero mm" offset of the ruler itself if your ruler is like mine, where the zero doesn't start from the edge of the ruler.

Then calculate the offset using this formula..
Wheel Offset = Hub Depth - (Track Width / 2)
In my case then it would be 104 - (204/2) = +2mm.

Now i can answer with confidence that my Globeline has +2 offset!