Although this method should produce an accurate measurement at any ride height, it's highly recommended to measure at your final ride height. Reverse the offset (-47mm) and you now have 5 inches of design space for swooping, dramatic spokes and just 2 inches for hub clearance. In the end, the aspects of your unique vehicle and prospective wheels determine the success of your fitment. If your straight edge doesn't touch the wheel, add the distance measured earlier. Measurement of wheel offset can be positive or negative and is described in millimeters. The easiest way to measure backspace is to lay the wheel face down onto the ground so the backside of the wheel is facing up. Offset and backspacing are similar measurements. We suggest searching the internet for people who have installed the same wheels.

This image is not<\/b> licensed under the Creative Commons license applied to text content and some other images posted to the wikiHow website. You can't run an 11" wide front wheel where a 7.5" wheel used to roll. This style is common on most front-wheel drive vehicles.

The wheel offset can be positive, negative or zero depending on how the tyre sits in the wheel. In this case the clearance numbers are pretty close, so adding an adaptor will push the wheel out further than stock. Wheel offset is the measured distance from the wheel's hub mounting surface to the centre line of the wheel. Pushing the limits of wide and low is why we do this, but there are limitations. Next, we need to get a feel for how the current wheels fit on the car. References. Next we're going to walk you through a step-by-step method of determining if your dream wheel will even fit and what size adaptor to use. If your current wheels are ET20 and you follow his advice, you just tried to install wheels that stick out 40mm more than your current wheels... and it didn't work.

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\u00a9 2020 wikiHow, Inc. All rights reserved. Wheels don't just gracefully float up and down in the body when you hit a bump. Should you go with the powdercoated or chrome-plated wheels? If you want to go wide, you can't go low without rubbing hard. What we're looking for is a measurement of the distance between the face of the wheel and the inside of the fender. This image may not be used by other entities without the express written consent of wikiHow, Inc.
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\n<\/p><\/div>"}, https://www.youtube.com/watch?v=L19eoOX58R4&feature=youtu.be&t=20, http://bd8ba3c866c8cbc330ab-7b26c6f3e01bf511d4da3315c66902d6.r6.cf1.rackcdn.com/PDF_12846_Understanding_Wheel_OffsetR1.pdf, https://www.youtube.com/watch?v=L19eoOX58R4&feature=youtu.be&t=47, https://www.youtube.com/watch?v=L19eoOX58R4&feature=youtu.be&t=53, https://www.youtube.com/watch?v=L19eoOX58R4&feature=youtu.be&t=67, https://www.youtube.com/watch?v=L19eoOX58R4&feature=youtu.be&t=74, https://www.youtube.com/watch?v=L19eoOX58R4&feature=youtu.be&t=120, consider supporting our work with a contribution to wikiHow. Guessing will result in very poor fitment. If the offset were to stay the same while you added width, the additional width would be split evenly between the inside and outside. This image may not be used by other entities without the express written consent of wikiHow, Inc.
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\u00a9 2020 wikiHow, Inc. All rights reserved. In the picture above, the wheel's mounting surface, also known as mounting pad, is shaded lime green. Wheel Offsets 101: The Basics of Wheel Offsets, How to Measure Wheel Bolt Pattern and Backspacing - OnAllCylinders.

Wheel centerline (outboard flange to inboard flange measurement, divided by 2), If backspace is less than the wheel centerline, the offset is negative A wheel can come with a zero offset, positive offset, or negative offset. For example, if you have a front-wheel drive car, then you might need to get positive offset wheels with a specific measurement. This measurement will be known as your clearance factor and will be the measurement to which all prospective wheels will be compared. More importantly, why do we need them.. and how does a +10mm or -47mm offsets really apply or affect my vehicle/machine? What Size Adaptors Will I Need To Fit These Wheels? Your email address will not be published. new wheel clearance factor + adaptor thickness =, Wheel offset is commonly known as ET, an abbreviation for a German word meaning "press depth. Knowing the wheel offset is important for ensuring that you purchase compatible tires whenever you want to replace or upgrade them. Get the latest updates on new products and upcoming sales. Tip: The offset is negative if the center line measurement is bigger than the hub measurement. Higher in number towards the wheel? To add an adaptor to the measurement, simply add the thickness of the adaptor to the clearance factor of your new wheel. Next, we sat a straight edge on the mounting pad and extended it out to touch the barrel. If you don’t have a straight edge with millimeter measurements, multiply the measurement in inches by 25.4 to. The deep lips and steep spoke drops just cant happen within 2 inches of room. Higher in number towards the hub? If in doubt - always ask for pictures of the offset stamp and the back of the wheel. wikiHow, Inc. is the copyright holder of this image under U.S. and international copyright laws. The basics: The offset can be one of three types (measured in millimeters).*. If your straight edge sits on the tire and doesn't touch the face of the wheel, measure the distance between the straight edge and the lip of the wheel. Now that you have a solid understanding of wheel offset we can dive into the math.

Or, you might be interested in getting negative offset wheels or “deep dish” wheels to complement your car’s design, but there may be a limit to how deep you can go according to your car’s specifications. We know ads can be annoying, but they’re what allow us to make all of wikiHow available for free. We're looking to install front wheel that measures 18"x8" ET60. Use our wheel offset calculator to visualize the new tire position when changing wheel and tire sizes. Nearly every wheel has the offset stamped on it somewhere. If you are unsure about what type of wheels to purchase for your vehicle after determining the offset, consult with a mechanic or auto body shop. Just because the math looks right doesn't automatically mean they fit. By using our site, you agree to our. wikiHow is where trusted research and expert knowledge come together. Measured in millimeters, offset is the measurement of choice for many custom wheel manufacturers. When measuring for clearance, take the time to measure front and back. In the picture above, a + and - have been drawn in yellow on either side of the wheel centerline. The hub mounting surface is toward the back or brake side of the wheel. For example, if the measurement was 244 mm (9.6 in), then the center line measurement is 122 mm (4.8 in). Zero offset occurs when the hub mounting surface is even with the centerline of wheel. Most factory rims come with a positive offset, which is achieved when wheel manufacturers place the hub mounting surface to the street side of the centerline. We measured a distance of 12mm to the very inside of the fender and added 4mm to reach the lip of the wheel.

Be realistic.

Google has a wealth of information. While this version of offset is easy to understand on a basic level, it lacks the details and specifics that a +/-mm offset provides, which can mean the difference between wheels rubbing, sticking our too far or just plain not fitting. This is where your next door neighbor has been confusing you for all these years. Notice the "deep dish" look created as the hub mounting surface is located inward and way from the outside of the vehicle. (wheel width / 2) x 25.4 - ET +10 = clearance factor, This equation divides the width of your wheel in half to find the centerline.

The clearance measurements we suggest start at the inside of the fender.

A positive offset indicates the mounting pad is positioned towards the face of the wheel.

The hub mounting surface is even with the centerline of the wheel (dashed line to left). Higher compared to what? [2] When measuring for total clearance, it's best to take these measurements at the same ride height you plan to use the new wheels.

If the wheel offset is not correct for your vehicle, handling can be adversely affected. If you really can’t stand to see another ad again, then please consider supporting our work with a contribution to wikiHow. wikiHow, Inc. is the copyright holder of this image under U.S. and international copyright laws. Pictured above, the straight edge did not sit flat on the face of our wheel. Notice how the center hub mounting surface is locted all the way to the outside of the wheel. The problem with a +30mm and higher offset is that the hub is so close to the front of the wheel, the design of the wheel is going to suffer tremendously. The wheel offset is simply the distance from a tire's center line to the hub's mounting surface.



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