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Here are some popular tire sizes

TYPE

The first part of your size is usually going to be a letter. This letter indicates what type of vehicle or use the tire is intended for. Commonly, you’ll find a P there, meaning the tire is meant for “Passenger Vehicles,” but you might also see LT for “Light Truck” or ST for “Special Trailer.” Basically, this letter means that the tire meets the basic standards of use in the US for a certain type of vehicle. Sometimes, there may not even be a letter at all. (This just means the tires are Euro-Metric and might have a different load index. You can still use them.)

WIDTH

The first 3-digit number represents the tire width. The width is measured from sidewall to sidewall in millimeters, and that measurement is exactly what the first number is. So, in the example above, the first number is 225 and this means the tire is 225 millimeters wide from sidewall to sidewall.

ASPECT RATIO

The 2-digit number you encounter after the slash isn’t as straightforward as the first one. This number is the aspect ratio. Instead of being a 1-1 measurement, this number represents the ratio of the height of the tire's cross-section to its width. In the size above, for example, the number is 60, this means the height is equal to 60% of the tire’s width. The bigger that number is, the taller the sidewall will be.

CONSTRUCTION

Here you’ll find the other letter you’ll encounter in tire size, and this time it represents the tire’s internal construction. The most common, and therefore what you’ll usually see, is the letter R which stands for a Radial construction. This basically means the plies are arranged radially. The only other one you might come across is D, which indicates Diagonal (or bias) construction. It doesn’t affect the tire dimensions.

DIAMETER

The last part of your size is the bit you’re most likely to already know: the diameter. You may have also heard this number referred to as the rim size, that’s because that’s basically what it tells you: the size of the wheel it’s meant to fit on. This is measured in inches from one edge to the other. In the example above, the diameter is 15 meaning the tire is intended for a 15” wheel.