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What size rims do I get?

When it comes to upgrading the wheels on your vehicle, one of the most important decisions you'll need to make is the size of the rims. The right rim size can significantly enhance the appearance and performance of your car or truck. In this article, we'll guide you through the process of determining the ideal rim size for your specific vehicle.


Understanding Rim Sizes


Rim sizes are typically expressed in a format like "17x8" or "20x10". The first number represents the diameter of the rim in inches, while the second number represents the width of the rim in inches. The most common rim sizes range from 15 inches to 22 inches in diameter, with widths varying from 6 inches to 12 inches.


Factors to Consider


When selecting the right rim size for your vehicle, there are several key factors to consider:



  • Vehicle Specifications: Check your vehicle's owner's manual or consult with the manufacturer to determine the recommended rim size range. This information is crucial to ensure the rims you choose will fit properly and not cause any clearance issues.

  • Tire Size: The rim size you choose should be compatible with the tire size you plan to use. Larger rims may require larger tires, and vice versa.

  • Wheel Offset: Wheel offset refers to the distance between the mounting surface of the wheel and the centerline of the wheel. This measurement is important to ensure the wheels fit properly and don't rub against the vehicle's suspension or bodywork.

  • Aesthetic Preferences: While functionality is the primary concern, you may also want to consider the visual impact of the rim size. Larger rims can give your vehicle a more aggressive, sporty appearance, while smaller rims may provide a more subtle, classic look.


By carefully considering these factors, you can select the perfect rim size that not only fits your vehicle but also enhances its overall appearance and performance.


Measuring Your Vehicle's Wheel Well


To determine the maximum rim size that will fit your vehicle, you'll need to measure the available space in the wheel well. Here's how to do it:



  1. Measure the diameter of the existing wheel from the inside of the tire to the inside of the tire.

  2. Measure the width of the existing wheel from the outer edge to the outer edge.

  3. Measure the clearance between the existing wheel and the suspension components, such as the brake calipers and control arms.


With these measurements, you can consult with a tire and wheel specialist or use online resources to find the maximum rim size that will fit your vehicle without causing any clearance issues.


Remember, it's always best to consult with a professional or do thorough research to ensure you choose the right rim size for your vehicle. Proper fitment is crucial for both safety and performance.

Is it better to have 18 or 20 inch wheels?


Neither 20-inch nor 18-inch wheels are inherently "better"; the best choice depends on your priorities, as 20-inch wheels offer a sportier look and sharper handling, while 18-inch wheels provide a more comfortable ride and better fuel efficiency. Larger 20-inch wheels typically have lower-profile tires with less sidewall, which improves cornering and handling but makes the ride bumpier and can be less comfortable on rough roads. In contrast, 18-inch wheels allow for taller, more flexible sidewalls that absorb road imperfections better, and their lighter weight can improve acceleration and fuel economy.
 
20-inch wheels

  • Pros:
    • Sportier look: Larger wheels can fill the wheel well more, which many drivers find aesthetically pleasing. 
    • Improved handling: Shorter, stiffer sidewalls lead to a more direct steering feel and better cornering performance, especially on dry roads. 
  • Cons:
    • Harsher ride: The reduced sidewall means less cushioning, so you'll feel more of the bumps and imperfections in the road. 
    • Lower fuel economy: The increased weight of larger wheels can make the engine work harder, leading to slightly lower fuel efficiency. 
    • Higher risk of damage: Lower-profile tires offer less protection for the wheel rim from potholes and other hazards. 
    • More expensive tires: Replacement tires for 20-inch wheels are often more costly. 

18-inch wheels 
  • Pros:
    • More comfortable ride: Taller sidewalls act as a natural shock absorber, providing a smoother and more comfortable ride over bumps. 
    • Better fuel efficiency: Their lighter weight can lead to slightly better gas mileage. 
    • Better off-road capability: The taller sidewalls are more flexible, which can be beneficial when off-roading and allow for airing down the tires. 
    • Greater tire protection: The extra sidewall provides a buffer for the rim, reducing the risk of damage from impacts. 
  • Cons:
    • Less sharp handling: The flexibility of the taller sidewall can result in a slightly less responsive steering feel compared to 20-inch wheels. 
    • Less aggressive look: Some may find that 18-inch wheels look small or less aggressive in the wheel well. 



Are rim visualizers free to use?


It's completely free to try as many styles as you want. Have some fun with it, and try new styles and designs outside of your comfort zone. You never know when you're going to find a new favorite wheel.



How to know which size rims to buy?


If you're using your existing tires, it's important to know the size of your tires because the diameter of the rim needs to match your tires. For example, if your tires are size 205/55R/16, you need wheels with a 16-inch diameter.



How do I find out my rim size?


You can find your rim size by looking at the tire's sidewall, the sticker on the driver's side door jamb, or the owner's manual. The rim diameter is the last number in the tire size code, which often looks like P215/60 R17, where '17' is the rim diameter in inches. You can also find it stamped on the rim itself, often with the width, like '18x7.5'. 
From the tire or vehicle

  • Read the tire sidewall: Look for a code such as P215/60 R17 or 205/55 R16. The last number in this series is the rim diameter (e.g., 17 or 16). 
  • Check the driver's door jamb: Open the driver's side door and look for a sticker, sometimes called a placard, with vehicle information, including the original equipment tire size. 
  • Consult the owner's manual: The manual contains your vehicle's specifications, including the correct rim size. 
  • Look for the manufacturer's sticker: This sticker, found on the driver's side doorjamb or in the glove box, provides the original equipment (OE) tire size, but it's important to check your current tires or the rim itself if you suspect the wheels have been changed. 

From the rim
  • Inspect the backside of the wheel: The size is often stamped into the metal, usually on the spokes or the backside.
  • Look for the "18x7.5" format: The first number is the diameter in inches, and the second is the width in inches. 


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.