To find the right tire size for your car, you can use a tire size calculator. Here are some websites that offer tire size calculators:
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Goodyear Tire Finder: You can use your vehicle information (year, make, model, and version/option) to find the right tire size for your car. You can also use the numbers on your tires sidewall.
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1010TIRES.COM Tire Size Calculator: This calculator allows you to compare up to 10 additional tire sizes before making a purchase.
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SimpleTire: This website provides a general rule of thumb for tire sizes: going up one size in tire width and down one size in aspect ratio (the height of the sidewall) will still equate to the same overall tire diameter.
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Calculator.net Tire Size Calculator: This calculator can help you find the dimensions of a tire based on its code. It can also provide a comparison of alternative tires that are compatible with a given wheel size.
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Les Schwab Tire Size Calculator: This calculator converts metric measurements to inches so you can easily compare the diameter, width, sidewall, circumference, and revolutions per mile. It will also tell you the difference in tire speed between your comparison tires. As a general rule, you want replacement tires that are within 3 percent of the diameter (height) measurement of your existing tires’ diameter.
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BFGoodrich Tires: Your correct tire size and tire pressure can be found in your vehicle's owner's manual in the glove compartment or on the OEM sticker on your driver's side doorjamb.
It's important to note that a tire's true physical size can vary from the dimensions provided by the tire manufacturer, so it's best to use these calculators for general comparison purposes only. It's recommended that you base sizing or purchase decisions on the calculator results in combination with other factors such as your vehicle's owner's manual and the advice of a tire professional.