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What tire size can I substitute?

When it comes to replacing your vehicle's tires, finding the right size can be a crucial decision. The tire size you choose can impact your car's performance, handling, and safety. In this article, we'll provide a detailed guide on how to substitute tire sizes to ensure a proper fit and optimal performance.


Understanding Tire Size Specifications


Tire sizes are typically expressed in a format like "P215/55R17". This code provides key information about the tire, including the width (215 mm), aspect ratio (55%), and rim diameter (17 inches). Substituting tires requires careful consideration of these specifications to ensure compatibility with your vehicle.


Factors to Consider When Substituting Tires



  • Tire Width: The tire width should be within 10-20 mm of the original size to maintain proper handling and clearance.

  • Aspect Ratio: The aspect ratio, or the ratio of the tire's sidewall height to its tread width, should be similar to the original size to preserve the overall tire diameter.

  • Rim Diameter: The rim diameter must match the original size to ensure a proper fit and avoid issues with the brakes, suspension, and other components.

  • Load Rating and Speed Rating: These ratings indicate the tire's maximum load capacity and maximum safe speed, respectively. Substituted tires should have equal or higher ratings than the original.


By considering these factors, you can find a suitable tire size substitute that will maintain your vehicle's performance and safety.


Steps to Substitute Tire Sizes



  1. Locate the original tire size information, which is typically found on a placard inside the driver's side door jamb or in your owner's manual.

  2. Determine the acceptable range for tire width, aspect ratio, and rim diameter based on the original specifications.

  3. Research tire options that fall within the acceptable range and meet or exceed the original load and speed ratings.

  4. Consult with a tire specialist or your vehicle manufacturer to ensure the substituted tire size is compatible with your vehicle.

  5. When installing the new tires, ensure they are properly inflated and balanced for optimal performance and safety.


By following these steps, you can confidently substitute tire sizes and maintain the performance and safety of your vehicle.

Can I drive with different size tires?


Mismatched tires may have different levels of grip and responsiveness, which can compromise your ability to control the vehicle, especially in adverse weather conditions. Uneven Wear – Mismatched tires can wear unevenly, leading to premature tire wear, reduced tread life, and potential safety hazards.



Can I replace my tires with a different size?


Once you choose a tire size for your vehicle, you'll want to stick with that size when you buy replacements. The reason for this is that a differently sized tire can confuse your speedometer and even cause damage to your vehicle's anti-lock braking systems and stability system calibrations.



What is the acceptable difference in tire size?


As a general rule, you want replacement tires that are within 3 percent of the diameter (height) measurement of your existing tires' diameter — assuming your current tires are what your owner's manual recommends.



Can I put 55 tires instead of 65?


It's highly recommended to use the exact tire size recommended for your car. However, in a pinch the tire width and aspect ratio can be changed slightly and still fit on your rim. Although this will still work, keep in mind it may have adverse effects on the performance of your car.



How much can I deviate on tire size?


Permissible deviations from the tire size are: +/- 3% for the tire width. +/- 5% for tire height. +/- 2% for tire diameter.



Can I replace 235 tires with 245?


As the tire size of 235 and 245 is very close. Moreover, you can see no big difference between both rims. So, you can easily put 245 tires with 235 rims. As you can see, replacing your 235 tires with the 245 tires can be more convenient.



Can I use 245 tires instead of 235?


However, as the 235 and 245 tire sizes haven't any significant difference, we don't think there would be any issues you can face. Is There Any Big Difference Between 245 And 235 Tires? No, there is no big difference between 245 and 235 tires. The difference between 235 and 245 is only 3/8 inch.



How much can you change tire size?


When changing tire sizes, we recommend staying within 3% of the diameter/height of the original tire. Any more than this and you face the risk of brake failure.



Is the a big difference between 215 and 225 tires?


Converting these measurements to inches helps in visualizing the difference more clearly. A 215 tyre converts to approximately 8.46 inches, while a 225 tyre equates to around 8.86 inches. This means that the 225 tyre is slightly wider than the 215 tyre, albeit the difference may seem subtle on paper.



Can I use 225 tires instead of 235?


Can I Use 225 and 235 Tires Interchangeably? In some cases, yes. However, it's important to check your vehicle's manual or consult a professional before making any changes. Swapping out tires without checking for compatibility can mess with your speedometer, affect your handling, and even cause long-term damage.


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.