Knowing your car`s characteristics is essential for many aspects of ownership, including choosing the right wheels. Two key measurements you`ll need to be familiar with are offset and backspacing. Here`s a quick guide on how to calculate them.
Do Wheel Offset And Backspacing Correlate With Each Other?
In fact, many drivers mix up these two terms, but they actually describe different aspects of the wheel. To put it simply, offset is the distance from the centerline of the wheel to the mounting pad, while backspacing is the distance from the backside of the wheel to the mounting pad.
Offset is typically expressed in millimeters and can be positive, negative, or zero. A positive offset means the mounting pad is closer to the outboard side of the wheel, while a negative offset puts it closer to the inboard side. Most factory-issued wheels have a positive offset, but this can vary depending on make and model. A zero offset is when the centerline of the wheel and mounting pad are even with each other.
Backspacing is typically expressed in inches and is always a positive measurement. To calculate it, simply measure the distance from the backside of the wheel to the mounting pad. It is measured between the inboard and outboard sides of the wheel. In contrast with wheel offset, which is measured from the centerline, backspacing is measured from the backside of the wheel.
Why Do You Need To Know It?
Calculating the wheel offset and backspacing of your car is important for a few reasons. First, it can help you determine what size wheels will fit your car. Second, it can assist you in choosing the right wheel width and offset combination. And third, it can help prevent rubbing issues when installing new wheels.
If you`re looking to upgrade the wheels on your car, knowing the right offset and backspacing is essential to ensuring a proper fit. Many aftermarket wheels are designed with different offsets and backspacing than factory-issued ones, so it`s important to select a set that`s compatible with your car. Otherwise, you could end up with wheels that rub against the suspension or body of your car, which can lead to a host of problems.
How To Calculate Wheel Offset & Backspacing?
In simpler terms, offset is the distance from the hub to the center of the wheel. To put it another way,
Offset = Measured Backspace – Calculated Wheel Center Distance.
Let`s take an example. You have a car with a wheel size of 15 by 6 inches. You take a measurement of the wheel center distance and find it to be 4.5 inches. You then take a measurement of the backspace and find it to be 3.5 inches. To calculate the offset, you would subtract the wheel center distance from the backspace, giving you an offset of -1 inch (negative offset). In millimeters, it would be 25.4 mm.
Backspace is a bit more complicated, but still relatively simple to calculate. Backspace = Measured Offset + Calculated Wheel Center Distance. We take another example where we know the offset is -1 inch (or 25.4 mm) and the wheel center distance is 4.5 inches (or 114.3 mm). To calculate the backspace, we add the offset to the wheel center distance, giving us a backspace of 3.5 inches (or 88.9 mm).
To sum it up, if you know either the offset or the backspace, you can easily calculate the other one using our simple formulas. Just remember that offset is measured from the centerline while backspace is measured from the backside of the wheel!
What Should You Know About Wheel Offset And Backspacing Calculation?
OK, the calculation seems pretty simple, right? But there are a lot of potholes that you can fall into if you don`t know what you`re doing. Let`s go over a few things that you should keep in mind when calculating offset and backspace.
First, it`s important to know that these measurements are taken from the point where the wheel mounts to the car. This is typically at the hub, but on some cars, it can be at the suspension or brake assembly. It`s important to take your measurements from the same point on each wheel to get accurate results.
Second, make sure you measure correctly! A lot of people make mistakes when taking their measurements, which can lead to inaccurate results. We recommend using a tape measure for accuracy, but if you don`t have one handy, you can always use a ruler or measuring tape. Just be careful and make sure you`re taking your measurements from the correct points on the wheel.
Also, pay attention to the units of measurement. Offset is typically measured in millimeters, while backspace is usually measured in inches. Make sure you`re using the right units when you`re doing your calculations, or you could end up with some very wrong results.
Besides, after taking the measurements and making all the calculations, you should always test-fit the new wheels on your car before you buy them. This is the only way to be absolutely sure that they`ll fit correctly.
Finally, keep in mind that these calculations are only approximate. There are a lot of factors that can affect the accuracy of your results, including the width of the wheel, the diameter of the tire, and even the type of car you have. If you`re unsure about your results, we recommend consulting a professional to get the most accurate information.
Now that you know how to calculate offset and backspace, it`s time to put your knowledge to the test! Try our offset and backspace calculator tool to see how it works. Simply enter your information into the fields and hit calculate. You`ll instantly see your results, so you can compare different scenarios and find the perfect setup for your car. Good luck and happy calculating!