Check out the diagrams below for a visual illustration of each offset type. Many factory rims have this offset type. Backspacing is an older system of measurement to determine how deep the mounting pad is located in the wheel. Correct backspacing allows enough room for the suspension, brake, and steering systems to operate without interference from the wheel. Positive offset creates more backspace, while negative offset reduces backspace. As you can see, this distance can be either negative or positive.
High positive offset wheels are typically found on front-wheel-drive cars and modern rear-wheel-drive performance cars such as Corvettes, Camaros, and Mustangs. Negative offsets yield "deep-dish" wheels commonly found on some of our favorite older cars. So, if a wheel has an offset of 50mm, that means that the face where the wheel will bolt to the hub is 50 millimeters to the outer, curb side from the wheel's centerline.
Conversely, an offset of mm is the opposite, 50 millimeters to the inside of the centerline, yielding a deeper "dish" in the wheel. When bolted up to your car this means that a lower offset wheel will stick out farther. Obviously, a negative offset works the same way.
A mm wheel replaced with a mm wheel will move 1" outward as well. Also worth noting are bolt circle and center bore. Bolt circle refers to the diameter of a circle drawn through the center of the wheel studs. On a four or six-lug car, this is easy to measure, simply go center to center on the holes or studs.
Five lug wheels and hubs are more common to the cars that we love, and the odd number can make them a bit tricky to measure. To quickly measure on the wheel, center the measuring tape or ruler on one hole, skip a hole, then measure to the outside of the next hole. This is the best way to measure bolt circle without a template. Measure from the outside of one stud to the center of the stud across from it. There are also plenty of bolt circle templates available, such as our part These make it easy to measure bolt circle quickly and accurately.
Also critical is the center bore. This is the hole through the center of the wheel, and if it's smaller than the protruding part of your hub or axle, the wheel will not fit. Check out our Wheel Bolt Pattern Guide to learn more about measuring all types of wheel bolt patterns.
The most important takeaway here is not to confuse offset and backspacing. Depending on the type of vehicle, the tire size desired, the stance, and the type of wheel, offset will affect all of this. Many vehicle owners like the aggressive look of a negative offset, but it can be an issue on some vehicles. Backspacing is the cousin of offset.
Backspacing is the amount usually measured in inches of distance that the mounting surface of the wheel is away from the inner edge of the wheel. Backspacing is usually a positive number, but in certain circumstances, like on a dually pickup truck, it can be negative.
The amount of backspacing a wheel has can significantly alter the position of the wheel on a vehicle. For example, on a Ford F, the stock 18x8 inch wheels has a 6. This wheel backspacing is good for a stock sized tire, and keeps the wheel and tire combination inside the fender. Many aftermarket wheels will have a different backspacing- for example, and 18x9 Fuel Hostage could have a 5. Depending on the amount of lift, tire size, and other specific vehicle options, all of those wheels could work on that vehicle.
Offset and backspacing can either make or break the look of your vehicle, but they have a much more important role than that.
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