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How do I know my alloy wheel size?

To know your alloy wheel size, you need to look for the size information printed on the existing wheels or in your vehicle's owner's manual. The wheel size is typically expressed in a format like "17x8J" or "18x8.5ET35", which provides details about the diameter, width, and offset of the wheels.


Understanding Alloy Wheel Size Specifications


Alloy wheel sizes are typically expressed using a few key measurements:



  • Diameter - This is the diameter of the wheel, usually measured in inches. Common sizes are 16, 17, 18, 19, and 20 inches.

  • Width - This is the width of the wheel, also measured in inches. Typical widths range from 7 to 10 inches.

  • Offset - The offset is the distance from the mounting surface of the wheel to the centerline. It's measured in millimeters (mm) and can be positive, negative, or zero.


The full wheel size specification will look something like "17x8J" or "18x8.5ET35", where the first number is the diameter, the second number is the width, and the letter/number combination after indicates the offset.


Finding Your Wheel Size


To determine your current wheel size, you can check the following places:



  • Look on the existing wheels - The size information is usually stamped or printed on the inside or outer edge of the wheel.

  • Check your owner's manual - Your vehicle's owner manual should list the factory-installed wheel size.

  • Inspect the tire sidewall - The tire size, which includes the wheel diameter, is printed on the sidewall of the tire.


Once you know your current wheel size, you can use that information to find compatible replacement alloy wheels that will fit your vehicle properly.

Kevin's Auto

Kevin Bennett

Company Owner

Kevin Bennet is the founder and owner of Kevin's Autos, a leading automotive service provider in Australia. With a deep commitment to customer satisfaction and years of industry expertise, Kevin uses his blog to answer the most common questions posed by his customers. From maintenance tips to troubleshooting advice, Kevin's articles are designed to empower drivers with the knowledge they need to keep their vehicles running smoothly and safely.