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Choosing the right tire size increases safety, improves handling, and relieves stress on brake components. So if you're shopping for new tires, our tire size calculator can show you any tire's diameter, width, sidewall, circumference, and revolutions per mile measurements. You can even compare two different tires' measurements using our tire size comparison option.
Tire Code | Diameter | Tire Width |
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Disclaimer: These calculations are just estimates and are for informational purposes only. Alternative size suggestions are for reference only, and the options shown may not be exhaustive. We recommend that you verify these figures with the tire manufacturer for your specific tire and application.
To use our tire size conversion calculator, you'll need to know the basic tire measurements, which can be found in the tire code.
If you're looking for a basic tire diameter calculator that can show you other essential specs like tire width and circumference, follow these steps:
If you're looking to see the measurements of two different tires side by side, you can use this option to see how each tire stacks up. Our calculator will even automatically show you the size differences.
When changing tire sizes, we recommend staying within 3% of the diameter/height of the original tire at most—any more than this and you could risk increased wear and tear or even brake failure.
To use our calculator, you'll need to know the basics of how to read a tire size based on the tire size code printed on the sidewall.
To find your tire size, you'll need to look at the sidewall of your tire and look for the code printed in the largest size. It should be the leftmost code and should start with a letter, followed by a three-digit number, a backslash, and then two more two-digit numbers with a letter in the middle.
For example, for the Mickey Thompson Baja Legend MTZ Mud-Terrain 33" tire, the code would be P285/75R16. In this case, you'd be looking at the 285, the 75, and the 16 to enter into the calculator.
You might be surprised at how many different codes are included in just a handful of number and letter combinations. Here's what some of the key tire codes mean.
But these aren't all the codes. You can also see codes for things like approved extreme driving conditions, temperature grades, traction grades, max inflation pressure, whether the tire is tubeless, whether the tire is produced for a specific manufacturer, and much more.
Using the wrong tire size can lead to worsened handling, increased strain on your truck's suspension and transmission systems, and stress on its brake components. Having the wrong diameter can even affect your speedometer reading. It can also be just plain dangerous, so it's important to make sure you've got it right.
Here are a few common considerations when choosing tire sizes.
One of the most common reasons people change tire sizes is because they've upgraded their rims. A good rule of thumb is that the bigger the rim, the thinner the tire you can expect to need. That's because your wheel well doesn't get bigger to accommodate the extra space your rim and tire take up, so a thinner tire can help offset that.
That doesn't necessarily mean you need bigger rims in order to get bigger tires. You can potentially fit different sizes of tires onto the same rims, but as you probably guessed, bigger rims open up more tire size options.
In relation to tires, handling is all about where the rubber meets the road. Wider tires provide more surface contact with the road, leading to better handling. Meanwhile, diameter also leads to shorter braking distances but potentially slower acceleration. When it comes to the elements, however, more contact with the road can also mean higher likelihood of hydroplaning despite better dry-weather traction.
If all of your tires are heavily worn, you should replace them all at the same time. But if you have fairly new tires and get a single untimely flat, you can probably get by with replacing just one. If that's a front tire, it's a good idea to swap it with a rear tire. It's also OK to replace a pair of tires if one set wears out more quickly than the other—but the same rule applies, and you should put the new tires on the rear axle.
Bigger wheels translate to fewer rotations over the same distance. Since your speedometer measures your speed using the number of wheel rotations, if you increase your tire size, it'll think you're driving slower. The same goes for your odometer. It's a good idea to recalibrate your speedometer and odometer when you change tire sizes.
Whether you're replacing your tires because you're hitting the trail, lifting your truck, updating your ride for the winter, or accommodating a new set of rims, stay as close as you can to factory-recommended sizing.
The above calculator should help you find tires that fit your truck or are compatible with new wheels. The comparison calculator should also help you see if another tire will be a good replacement option for your current tires.
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