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Can I Replace 235 Tires with 245 Tires and Vice Versa?

Before diving into the specifics, let’s briefly review tire sizing and its importance. Tires are marked with a standardized code that provides crucial information about their dimensions, load capacity, and speed rating. This code typically consists of a series of numbers and letters, such as 235/45R17. The first number, 235 in this case, represents the tire’s width in millimeters. The second number, 45, indicates the aspect ratio, which is the height of the tire sidewall as a percentage of its width. The letter, R, signifies that the tire has radial construction, and the final number, 17, represents the diameter of the wheel in inches.

Can I Replace 235 Tires with 245 Tires?

The short answer is yes, you can replace 235 tires with 245 tires, but there are important factors to consider before doing so. While the difference between the two sizes may seem small, it can have various implications for your vehicle’s performance and safety.

Explaining Tire Sizing Differences

The primary difference between 235 and 245 tires lies in their width. A 245 tire is 10 millimeters wider than a 235 tire. This width change may not significantly impact most vehicles, but it can affect certain aspects.

Effect on Overall Diameter and Speedometer Accuracy

When you replace a 235 tire with a wider 245 tire, the overall diameter of the tire increases. This can lead to a slight change in your vehicle’s ride height and affect the accuracy of your speedometer. A larger diameter tire will cover more ground with each revolution, causing the speedometer to display a slightly lower speed than your actual travel speed. It is essential to consider this discrepancy to avoid potential legal issues and ensure your speedometer remains accurate.

Impact on Handling and Performance

The change from 235 to 245 tires can also have an effect on your vehicle’s handling and performance characteristics. Wider tires offer a larger contact patch with the road, which may improve traction and cornering stability. However, it is crucial to ensure that the wider tires fit within your vehicle’s wheel wells and do not cause any rubbing or interference with the suspension components or bodywork. Consulting with a professional tire expert or your vehicle manufacturer is highly recommended to ensure a proper fit and optimal performance.

Factors to Consider Before Replacing Tires

Before proceeding with a tire replacement, it’s important to consider several factors to make an informed decision. These factors include:

Vehicle Manufacturer’s Recommendations

To maintain your vehicle’s intended performance and safety, it’s always wise to follow the tire size recommendations provided by the manufacturer. These recommendations are based on extensive testing and engineering to ensure the best balance between performance, handling, and safety. Deviating significantly from the manufacturer’s recommended tire size may impact these aspects, so it’s essential to consult your vehicle’s owner’s manual or reach out to the manufacturer for guidance.

Wheel and Rim Compatibility

When changing tire sizes, it’s crucial to consider the compatibility with your existing wheels and rims. Wider tires may require wider rims to ensure proper fitment and tire bead seating. Installing tires on incompatible rims can lead to poor tire performance, compromised safety, and potential damage to the tire or rim. Always consult a knowledgeable tire professional to determine the wheel and rim width for your desired tire size.

Suspension and Clearance Considerations

Modifying tire size can affect the suspension geometry and clearance within the wheel wells. Wider tires may rub against suspension components, bodywork, or the inner fender liner, leading to accelerated tire wear, compromised handling, and potential damage. Additionally, changing tire size can impact the suspension’s ability to absorb road imperfections and may result in a harsher or less comfortable ride. Ensure that the desired tire size matches your vehicle’s suspension design and that adequate clearance is maintained throughout the suspension travel.

Potential Issues with Tire Replacement

While replacing 235 tires with 245 tires is possible, there are some potential issues to be aware of:

Rubbing or Interference

Wider tires may rub against suspension components or bodywork during sharp turns or when the suspension is fully compressed. This rubbing can cause damage to the tires, suspension parts, or the bodywork itself. Careful consideration of tire size, wheel offset, and suspension setup is necessary to avoid rubbing or interference issues.

Impact on Fuel Efficiency and Ride Comfort

Wider tires typically have a larger rolling resistance, which can slightly decrease fuel efficiency. Additionally, wider tires may transmit more road imperfections and noise into the cabin, potentially compromising ride comfort. While the difference between 235 and 245 tires is relatively small, these factors should still be considered when considering a tire replacement.

It’s crucial to ensure that any modifications made to your vehicle, including tire replacements, comply with local laws and regulations. In some jurisdictions, altering the tire size beyond certain limits may be illegal and result in fines or penalties. Furthermore, insurance companies may have specific requirements regarding tire modifications. Always consult with local authorities and your insurance provider before changing tire sizes to avoid legal or insurance complications.

The Importance of Professional Advice

Considering the complexities involved in tire sizing and compatibility, seeking professional advice is highly recommended. Tire experts have the knowledge and experience to guide you through tire replacement, ensuring optimal fitment, performance, and safety. They can provide valuable insights tailored to your specific vehicle and driving needs, considering factors such as tire size, load capacity, speed rating, and handling characteristics.


In conclusion, replacing 235 tires with 245 tires, or vice versa, is possible, but it’s essential to consider the implications and factors mentioned above. While a slight difference in tire width may seem inconsequential, it can affect your vehicle’s overall performance, handling, and safety. Consulting with a tire professional or your vehicle manufacturer is the best course of action to ensure a proper fit, maintain safety standards, and optimize your driving experience.