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What size are my rims and tires?

The size of your vehicle's rims and tires is an important factor to consider, as it can impact the overall performance, handling, and appearance of your car. To determine the size of your rims and tires, you'll need to check the information provided on the sidewall of your current tires or consult your vehicle's owner's manual.


Finding Your Rim Size


The rim size is typically displayed on the sidewall of your tires in a format like "17x8.5J". The first number (17 in this example) represents the diameter of the rim in inches. This is the most important piece of information you'll need to know when replacing your rims.


Identifying Your Tire Size


The tire size is also displayed on the sidewall of your tires, usually in a format like "225/45R17". Here's what each part of the tire size means:



  • 225 - The width of the tire in millimeters

  • 45 - The aspect ratio, which is the ratio of the tire's sidewall height to the tread width

  • R - The construction type, in this case, radial

  • 17 - The diameter of the rim in inches, which must match the rim size


Knowing the exact tire size is crucial when replacing your tires, as the new tires must fit your vehicle's rims and wheel wells properly.


Considerations When Changing Rim and Tire Size


When considering changing the size of your rims and tires, it's important to keep the following in mind:



  • Larger rims and tires may require suspension and brake modifications to ensure proper fit and function

  • Changing the tire size can affect your vehicle's speedometer and odometer readings, as well as its fuel efficiency

  • Consult your vehicle's owner's manual or a professional mechanic to ensure any changes to rim and tire size are compatible with your vehicle


By understanding the size of your current rims and tires, you can make informed decisions when it comes time to replace them or upgrade to a new set.

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.