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Can you substitute 235-75R15 tires for 215-75R15?

It is not recommended to substitute 235-75R15 tires for 215-75R15 tires without consulting with a professional or thoroughly checking the vehicle specifications. While the aspect ratios (75) are the same, there are significant differences in the section width (235 vs. 215) and rim diameter (15 inches).

Here's why it's not advisable to make this substitution:

1. Section Width Difference: The section width of a tire refers to the width of the tread area that comes into contact with the road. Substituting a 235-section-width tire for a 215-section-width tire will result in a wider contact patch. This can impact handling, stability, and performance of the vehicle, especially when cornering or in wet conditions.

2. Rim Compatibility: The rim diameter (15 inches) is the same, but it's important to ensure that the 235-75R15 tires are compatible with your vehicle's rims. The wider section width of the 235 tires may not be suitable for the narrow rims designed for 215 tires, potentially leading to improper tire fitment and safety issues.

3. Speed Rating: Tires have a speed rating that indicates their maximum safe operating speed. Make sure that the 235-75R15 tires have the same or a higher speed rating compared to the 215-75R15 tires originally specified for your vehicle.

4. Load Index: Similarly, check the load index of the 235-75R15 tires to ensure that they can support the weight of your vehicle. It's crucial that the load index meets or exceeds the requirements of your vehicle.

5. Consult Professional Advice: It's always best to consult with a tire professional or refer to your vehicle's owner's manual before attempting such substitutions. They can provide expert advice based on your vehicle's specifications, ensuring safety and optimal performance.