Backspace and Offset Explained

Backspace and offset determine the position of the wheel and tire on the vehicle.  Wheel positions vary based on the application. Applications range from tucked under the fender to sticking out.

BackspaceOffset1.PNG

 

Correct backspace & offset eliminate clearance issues with fenders, brakes, struts or other possible obstructions. Some applications will require modification.

BackspaceOffset2.PNG

 

Backspace is the distance in inches from the edge of the rear flange to the mounting surface.

BackspaceOffset3.png

 

Offset is the distance in millimeters from the wheel’s imaginary centerline to the mounting pad.

backspaceOffset4.PNG

 

There are three main types of offsets: positive, zero and negative.

BackspaceOffset5.png

 

Positive offset:  The mounting pad is forward of the centerline (towards the street).

BackspaceOffset6.jpg

 

Zero offset:  The mounting pad is on the wheel centerline.

BackspaceOffset7.jpg

 

Negative offset:  The mounting pad is behind the wheel centerline (towards the vehicle).

BackspaceOffset8.jpg

 

Here’s a side-by-side look at each of the three offset types:

BackspaceOffset9.jpg

 

Both backspace and offset relate to the position of the mounting surface.  As seen below, the position of the mounting surface affects the position of the wheel on the vehicle.  You can also see how the offset impacts the appearance of the wheel.

BackspaceOffset10.jpg

 

Some vehicles run staggered offsets.  In a staggered setup the front wheel is narrower than the rear requiring different offsets for each.

BackspaceOffset11.png

Was this article helpful?
1 out of 1 found this helpful